1. A phrase which can be used to humiliate a person who you know well, who has just said something that has either failed at telling a joke, or has just said something stupid or embarrassing.

2. Said when there is a stranger nearby acting in a funny or weird way, or who complies with the above.

Both are generally said with a thumb in the direction of the offender, and a generic "pfft" noise.
Charlie: I've got one of those!

Ollie: Pfft... Who's this guy? *points thumb towards Charlie*
by FlakkyB November 28, 2009
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a simple, everyday question that (when used correctly) can turn any conversation sexual; similar to the phrase "that's what she said".

person 2 questions "who's the guy" to imply that person 1's original comment was about a sexual act that they have committed and now the asker is simply wondering who person 1 is doing it with; extremely humorous when person 2 is a straight male.
Demorris - "I felt it comin and here it is!!!!"

David - "Who's the guy?"
by yourstepmom March 1, 2011
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Who's Your Goo-Guy-Got-Goin'-Down? is the most social form of salutation. Primarily indigenous to West Coast North American Males, originating in California, this super-friendly hello is quickly spreading across the globe. Which only begs one question:

Who's YOUR Goo-Guy-Got-Goin'-Down?
Friend 1: Who's Your Goo-Guy-Got-Goin'-Down?
Friend 2: Oh yeah?
Friend 1: You're such an ASShole!
Friend 2: Great!
by Player! September 22, 2007
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