to be or to act dodgy in a blatant manner.

mack as fuck describes a person, situation or thing which is likely to bring things on top

portsmouth slang.
is that pig looking at us?
yeah, don't be mack.

wee mush, do you knows Dean Court?
yeah, he's mack as fuck.

don't stash your dirty rugs in there it's mack as fuck.
by uncrunk February 4, 2010
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1. to make out
2. to have sex with
3. in fact any closeness with a chick
4. to get beaten up
5. a form of truck
6. a brand of pies
7. a brand of floor buffers
8. a brand of australian apples
1. "i macked her well mate"
2. "i rang her up to organise a mack-sesh"
3. "yeh i reckon i'll mack her"
4. "guess what? me and bustin just got macked!"
5. "check that mack truck mate"
6. "i'll have two macks's thanks"
7. "dirty ay? just mack her till she's clean"
8. "hey alex or micheal, can you please change over the macks"
by alex February 24, 2004
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Making out with someone
Can also be used in differnt contexts:

Macking
Macks
Macked
Mack
-Julia: "OMG I saw Brittany macking Christina's boyfriend!"

-Haley: "Ugh Julia is such a whore, she macks every guy she sees."

-Melissa: "Did you see Josh at that jam this weekend?"
Christy: "Ya we pretty much macked all night"

-Caitlind: "You better mack him he's fucking sexy"
by ana.fuck you February 12, 2009
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noun: This common term can sometimes be used to describe a hard-ass individual who is constantly fighting homosexual urges, partly due to the fact that they are around members of the same sex. Some avid enthusiasts have been known to get the word "mack" tattooed somewhere on their upperbody, usually the chest.
Aaron: "Hey Eric. Did you hear about that mack Shane saying how he wanted to kiss Greg and then try to hide it by sneezing eight times in a row?"

Eric: "Eight times in a row?!"
by et87 February 20, 2009
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A slang word for the Sub-Machine gun known as Mac-10
Man that mofo micky he been pimpin my woman next time I see his punk ass I'm gonna blast him with my Mack biatch
by Anonymous April 26, 2003
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to kiss a lot. and make out. definitely not to woo or hit on.
oh my gazz...did you know that jells wants to mack all up on ryan's hot bod?! mmmmmmmmmmhmmmmmmmmmmmmmmmmm!!
by mandyjelly June 23, 2008
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