Top definition
When a guy is fucking a girl, usually the little sister of his best friend. The girl is under 18 or is not ripe in womanhood yet, she is still in puberty. It's one of the most severe cases of mackin.
Man that wankster is so horny! He went from mackin on his friend's sis, to srucking her!
by mackmaster January 13, 2005
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