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Phrase taken from the 2004 movie "The Girl Next Door." Can be used when disscussing sexual exploits, excessive drug usage, great plays in sports, a good book, and nearly anything. That's What A Man Does can be said at anytime when describing nearly anything that a man would do. Also, That Is So NOT What A Man Does can be used as a phrase of discontent towards something your buddy has done that offends you (ugly chicks, forget to pay you back for beer, etc.)
Me:Dude, I got so crunk last night I did two chicks at once on the roof.
Me:Except one was like 300 pounds and the other had backne like mad.
Andrew: No dude, so not what a man does.
by David Burner June 01, 2005
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The definition for "That's what a man does" entered by Burner is perfect.

the phrase itself derived from the Girl Next Door...
-There is this really hot girl, the girl next door
=So did you bang her yet?
-Yeah, right I banged her (sarcasm)

Lines that are associated with "what a man does":

"All I wanna do is bang hot chicks" (girl next door)
"We are all going streaking...through the quad to the gymnasium" (old school)
"F#CK IT, I'll squeeze one" (GND)
"We can't lose our composure" (OS)
"You got to use my girlfriend, shes so good, wanna give her a throw?" (GND)
"I guess I am a little freaked out about only having sex with one person (points to his wife) for the rest of my life" (OS)
"How's the rack?" (GND)
"Do you know how lucky you are to land someone as sexually enlightened as Hedi..look Columbus wasn't looking for America when he went sailing away, but he found it and that sure as heck worked out for the rest of us" (0S)
"I would have nailed her right there and then"(GND)

FOR INFO ON HOW TO DO WHAT A MAN DOES: Learn from anything that a man has done in the Girl Next Door (especially giving her Bourbon to get her drunk for sex) and Old School. These are textbook examples of "what a man does."
examples are listed above.
by Ytown man July 01, 2005
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