To get with a girl or to get with multiple girls.
No, this does not mean to make out with a hot girl but if you are "mackin' a biddy" or "mackin' biddies" then that is definitely an option depending on where things may lead with your biddy or biddies.
*Biddies are also known as "fly honeys"*
Bob: So what did you do over spring break, man?
Andrew: Oh I was mackin' biddies.

Phil: What is Andrew doing?
Terrence: Mackin' biddies.
by crazyypapayaa August 15, 2009
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The art of attempting to attract members of the opposite sex by form of hitting on, flirting, touching, and other flattering act of affection.
Joe : "yo Tim I heard you was mackin dem biddies the other night?"
Tim: "oh heeellzzzz yeah, i was hittin dat shit raw."
by Zyklon Win February 1, 2011
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