To mack is to chill. also can be used as macking (sometimes spelled maccin). Usually used when wanting someone to calm down.
ex1:
"Hey wassup?"
"nm, maccing, u?"

ex2:
"YO IM SO TIRED OF THIS SHIT"
"MACK!"
by Dee-Money$$$$ August 14, 2011
1) to pick up women; performed best when the man oscillates his arms back and forth while shifting his weight from leg to leg

2) to engage in sexual intercourse

3) to successfully complete an assignment (e.g. homework)

4) to thoroughly consume a meal
Look at Joe over there macking on those chicks! He's really busting the moves out tonight!

We were gonna mack, but I forgot my rubbers.

I'll be staying up late tonight. I have to mack my history paper.

He MACKED those gorditas!
by Z_19 December 19, 2009
to hit on a girl; A male flirt
I'm gonna go mack on that chick over there.
by Greg H March 17, 2003
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 04, 2010
to flirt with or seduce
I'm going to lay the mack down.
by Mackster March 24, 2006
A mack is a pimp's pimp. As a pimp controls his hos, a mack controls his pimps.
"Don't you see? All these pimps that you be seeing, I run them motherfuckers. I'm called a MACK. Better recognize."
by E~Dogg December 29, 2006
Mack can refer to a compact, blowback operated machine pistol made in 1964 chambered in .45 ACP or 9 mm.
Hey, Don, I'mma get my mack and lay about 4 niggaz.
by Mr. Real457 March 23, 2016
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