To jap

To clap on an erect penis or a vagina, whether your own or someone else's.

Guy 1: Dude, Susan came over last night and she japped me!

Guy 2: Dude, no way! That's so hot! I wish my girl would give me a japjab!

Guy 1: I wanted to jap her but she wouldn't let me.

by PepeSadforg July 21, 2015