1. "Zetus Lapetus!"
From: "Zenon Girl of the 21st Century," Zenon
Meaning: Oh my gosh, holy crap, freaking out, etc.
Use it: When you are in shock, in trouble, or overwhelmed.
2. "Oh, Mylanta."
From: "Full House," DJ Tanner
Meaning: Oh my gosh, good lord, no way, etc. (similar to Zetus Lapetus)
Use it: When you are pleasantly surprised, pleased, or shocked.
3. "Bazinga!"
From: "The Big Bang Theory," Sheldon Cooper
Meaning: Ha! Checkmate. Gotcha! Eureka! That's it! .
Use it: When you are trying to zing someone or after a funny joke, or when you come to a great realization.
4. "Did I do that?"
From: "Family Matters," Urkel
Meaning: Was that my fault? Oops... My bad...
Use it: To soften the blow when you messed up.
5. "Did I stutter?"
From: "The Office," Stanley Hudson
Meaning: Did you hear me? Do you understand? Don't question me.
Use it: When someone questions you and you mean business.
6. "It's going to be LEGEN... wait for it.... DARY."
From: "How I Met Your Mother," Barney Stinson
Meaning: This is going to be awesome. It's going to be amazing.
Use it: When things are going to be absolutely awesome.
7. "How you doin'?"
From: "Friends," Joey Tribbani
Meaning: What's up? How's it going? How are you?
Use it: When you want to be a little smooth while asking how someone is.
8. "Inconceivable."
From: "The Princess Bride," Vizzini
Meaning: Unimaginable, impossible, implausible, etc.
Use it: When you are dumbfounded or can't believe that something has just happened.
9. "Aaaallllll righty then."
From: "Ace Ventura: Pet Detective," Ace Ventura
Meaning: Okay! Well then.
Use it: When you are acknowledging a confirmation or when you are trying to be sassy to a comment someone has made.
10. “Houston, we have a problem.”
From: "Apollo 13," Jim Lovell
Meaning: Something's wrong. Uh oh. There's a dilemma.
Use it: When you run into a serious problem and you need to tell others.
DISCLAIMER: You can either look really cool and pop-culture savvy when you know all these catchphrases... or people will just look at you funny.