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1. To play with the hair of the person sitting in front of you (as at school).
2. To groom someone's hair or appearance.
3. To pick something out of someone's hair usually without their knowledge; from the rhesus macac monkey, known for it's penchant for grooming.
teacher: "Don't macack her. You're supposed to be taking a test."
by motheroftheword November 08, 2006
0 6
used to refer to ones penis.
Yacack can be used to refer to someone else's penis
Guy 1: "Hey look at macack!"

Guy 2: "Dude really put your pants back on. I'm starting to think you really are gay."
by Doober McFly February 21, 2011
4 0