Like the next time that school bully threatens you, just say "Stop, or you'll be injured bad." Maybe even punctuate it with a finger to his chest. Chances are that bully will be scared senseless, because he now knows he's messing with a KIng of Fighters!
And the next time you are trying to get with a honey, tell her "You are obsessed by desires." Be sure to say it in your best Antonio Banderas voice. It doesn't really make sense, but chances are you'll get laid.
And who doesn't wish they could go back to high school and change their yearbook quote to "Life is only training. Training and bowling." -Goro Daimon
Think how many freshmen's life you could change by helping them narrow down their priorities.
It's very simple. Next time you and your buddies are playing a game of pickup basketball, just tell somebody "Come again, slug. Just try to beat me. Nyah nyah." right after you block his layup. I guarantee he'll think twice before he drives the lane on you again. And if you lose, be sure to leave the court with some dignity. Just quote the mighty Rugal, "No... to meet such a fate...but i'll be back, you jerks." Ideally, you should be shaking your fist and vanishing into the shadows for maximum badassness.
But if you're ever in doubt, just say "Your fleas can't beat me. I know your thoughts." What can someone say after that? That's right, absolutely nothing. It's also a great thing to tell someone over the phone at 3 AM, or to write on a piece of paper and slip inside an enemy's locker. Get a step ahead of your enemies with King of Fighters.
But the single most kickass thing you can say in any situation is, "Absolute karate. That's Kyokugen. And don't forget it. Dweebenheimer" At this point high five one of your friends. You've already won. If they try to be a smartass and ask something like "What the hell is Kyokugen?" just keep saying "What's that, dweebenheimer? I can't hear you, dweebenheimer." until they go away.
Go away Defeated.
You have done well, warrior.
