Top Definition
a mely slap is when a girl is giving a guy a blow job and the guy slaps the girl in the face with his penis. in hopes that the girl will like it and giggle. you only give mely slaps to sleezy girls because you know they'll for sure like it. the mely slap originated in 2008 and received it's trademark name after a girl named melyssa franck who performed the first documented mely slap.
dude: man, i had the craziest sex last night.
dude's friend: haha really? did you mely slap her?
dude: of course i did. she totally loved it. haha.
by mely slap January 23, 2011

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