The consuming of a Big Mac from McDonald's, and shitting it out in a diarrhea-ish manner later on that day, or the first thing next morning.
Ketchup: (yelling into the bathroom) Hey Beef whats taking so long?

Beef: Oh I just had a Big Mac man!

Ketchup: And?

Beef: Its coming out of my ass right now, and I only had it a while ago! I'm having (yet another) Big Mac Shit Attack!

Ketchup: Ouch. I feel bad for the toilet after this one.

Beef: Yeah, me too.
by RogueMan7 December 17, 2007
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The act of consuming considerable amounts of liquor and launching ones self onto a unsuspecting person to make out with them usually in front of a large crowd.

Slangs: Macked, Mac all night, Ronnie macked
"Yo man! catch that guy Mac attacking those chicks!"
"Bro, hes pretty much my hero"
by Lemi545 December 2, 2009
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Sudden urge to eat food from McDonald's.
"I'm having a serious Mac-attack; could you spare me a dollar so I can get some fries?"
by Exiled Josh September 7, 2005
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A Mac Attack is the art of getting half a dozen or more cups of (free) water from MacDonalds and going into a car at nightime with a group of friends and throwing the cups at unsuspecting people with the objective of it hitting them and soaking them in MacDonalds tap water with perhaps a few ice cubes.

A much cheaper modo-alternative to the traditional egging.
Laurence - Yo Conway you keen to do something tonight?

Conway - What you got planned?

Laurence - A Mac Attack what else

Conway - Count me and the boyz in bro'
by The OG Mac Attacker January 25, 2011
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A sudden urge to eat a McDonald's Big Mac. Satisfying too many mac attacks leads to diabetes. And the fatness.
I feel a mac attack coming on.

That fatass looks like he's had one too many mac attacks.
by mcfakey March 3, 2006
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To succumb to death from complications from pneumonia, in conjunction with an immune system disease called sarcoidosis.
guy 1: Yo, where's Reggi?

guy 2: His sarcoidosis was acting up and he got pneumonia.

guy 1: Oh man, he had a Mac Attack
by Luviticus August 13, 2008
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Someone that's cool,laidback,and overall fucking awesome; Kasey Mac
"Dayum I wish I had the Mac Attack, so I finally won't be a loser."
by k@s3ym@cf0sh0 January 29, 2009
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