A term used to describe oral sex. Typically used by people who compare sexual anatomy to that of a McChicken or a McDouble.
Charles: What the hell took you so long!?
Jolene: We were talking.
Charles: Don't lie. You were McSnackin on his penis.
Jolene: We were talking.
Charles: Don't lie. You were McSnackin on his penis.
by VitaminJo May 01, 2009
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