I posted this in a Mastermind I'm part of sometime ago. I guess it's useful here too. --
Let's say a friend comes to you and say: "Dude, there's this new restaurant in town, pretty sweet, you should check it out." Ok, cut. Flash forward. You visit the restaurant and it's the most awesome-cool-amazing thing that you are aware of in the past century. Nice, huh?
Another friend comes to you and say: "Hey, just found the most coolawesome theater that I've ever seen! It's comfortable, full of nice people, etc etc. Man, you must check it out, like, today. Are you going today? No? Go tomorrow. Please, you need to see that". Cut, flash forward. You visit the theather and it's just a slightly cool theather.
Hmm... there's a problem here.
I don't have a well-defined theory to explain why this happens, but I got some ideas. In general, people try so hard to turn everything into an awesome thing, like, they can't living in a regular world, that it's too damn common the use of hyperbolis. And that's bad, because it messes up the communication: the listener will never take you serious.
Another way this comes up is in the internet. Your friend posts something slightly funny, you like it and comment "hahaha". Another friend posts something still funnier and you like and comment :"hahahahahahhah". And so on. In the end, to express that you're laughing hard at something, you're gonna need a hell of a string of haha's.
But, the problem is not just in talking and writing: body language counts too. If you usually moves too much, never stops your arms and legs, your movements will be automatically less meaningful for people around you. The same thing for facial expressions.
How to correct this
I noticed all this while reading hpmor. All characters expressions are meaningful: maybe because some of them received training in how to manipulate people? That's why I'm interested in mirroring Draco's modus operandi (if you haven't read hpmor yet, make yourself a favor).
- Talk less, more slowly and, when you can (and it isn't awkard), make some pauses  in your speech (btw, this helps with your second language, in case you're using one)
- Move your body less; try to communicate single points (like yeah, nay, etc) with your face. If possible, search for facial expressions images and practice in front of a mirror.
- Recalibrate the scale of your adjectives. Not everything is awesome or horrible: on one hand, it can be fine, sweet, cool, interesting, good, really cool etc, and in the other hand: not good, bad, unpleasureble etc. 
 Quoting directly from "Language Hacking Guide"
"For example, if I need a moment to recall the way to say a key word, I could say "I'm going to the..." [raise index finger analytically, take a step back, breath in deeply as if you are about to reveal the secret of life the universe and everything, and look out the window at the quest that awaits you] "... supermarket! Do you need anything?"
Don't overdo it, though.
 As native english speakers (I suppose). you can come up with better examples here than I.
I got a great email from a reader asking my thoughts on where he's at in life. He studied and worked in the USA, and went back to his home country to try to improve it... but he's having problems achieving all his goals with the culture there, and is thinking this through a lot. I like my response and I'm sharing it here - I edited out his personal details before posting this.
Good email. Tough questions.
First, I massively respect your point of view. It's interesting, isn't it? Whether you should focus on success -> change stuff, or try to do both at the same time... maybe both? Funny, I just wrote a blog post about this yesterday, but haven't posted it yet. I'm attaching it - "BLOG Ambitious Conundrum.txt" - some questions about how much to train, and how much to produce right away. Maybe it's relevant.
I guess the biggest question is, what's your main goal in life? What do you live and breathe for? Professionally, I'm working to be the greatest strategist of this generation. (It'll take me another 20+ years, but I think I've got a realistic shot at it) On a family level, I'm looking to build an international dynasty, a family like the Medici, Rockefellers, Rothschilds, Tokugawa, something like that.
Those goals come first and second, then I have other goals related to service, making change in the world, being a guardian of society, doing science, doing things professionally, etc. For me, I try to make my actions serve my larger roles.
A lot of you who have been following Tynan for a while probably understand by now that Tynan loves traveling and he's also learning Japanese these days. I'm sure a lot of Tynan's readers share a common passion for travel, and I'm sure a lot of you are either studying or planning to study a foreign language.