When someone has been conned/is controlled by someone else.
Milan is such a mack his girlfriend says jump and he replies how high.

Man i just donated to some guy in a wheelchair, and saw him stand up and walk away. Im such a Mack
by - July 14, 2004

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making out
Yeah, I macked on that fine guy over there.
by maa-k January 05, 2003

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Slang-Violent spl00ge or fapping experience often involving a trip to the hospital.
"d00d I completely mack'd on that wall.It went right through.."

"wtf m8 I destroyed that wall in a mackin'accident."
by Recon February 01, 2005

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to make out wit a hott girl
Rob only wanted to go on the haunted house cuz it was dark n he could mack his girl
by slut muffin August 19, 2004

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to engage in sexual intercourse
that slut macked him!!!
by anonymous January 05, 2004

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short for MacKeag, see MacKeag. And all of the other definitions.
Oh hey theres MacK, wonder what he's up to.
by MacKeag T. Resh November 24, 2004

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A very salty person, usually because his girlfriend sucks.
Mack is salty. His girlfriend made him act like they aren't going out.
by [e.99]Miracle December 04, 2004

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