a light smack upside the head, the intensity of which is more akin to ruffling someone's hair than to any real attempt to actually smack or harm the person. Originally heard/learned by submitter in: Montreal, QC, Canada.
She laughed at the teasing and gave him a quick smuck of warning.
She arched a brow at the taunt, and smucked him in response.
Definitions include: a term designating a high rank in one's group of friends or crew or a player to the utmost i.e. when you are crushing several girls at once and they don't find out you have reached cappo status the origin is from mafia families cappos are captains