Mack has two definitions:
A mack can be a person who is smooth, slick, the Best of the Best, a Pimp, a Ladies Man, the guy who runs everything a.k.a. the Boss. A mack is a person who is always flirting and hitting on girls. Almost always successful at it too.

-OR-

Mack can be used as a verb, as the act of flirting and hitting on girls.

Mack- (verb) To hit on, flirt with, or seduce a female by using verbal or sometimes physical means of persuasion.

see also: Mack Daddy

(verb) to flirt with or attempt to seduce

1. To hit on a girl
2. To eat food intensely

To hit on, flirt with, or seduce another by using verbal or sometimes physical means of persuasion.

mack" may derive from french slang where a pimp is known as a "mac" short for maquereau, or mackerel. Commonly, a mack is a pimp

mack is a flexible word as a verb; it can be used in pretty much any situation and its meaning will be understood.

1. to make out with
2. to fool around with
3. to do everything short of sexual intercourse
4. to display acts of public affection