חפשו מילה כלשהי, כמו smh:
 
1.
sexual act in which one inserts the member between the back of a kneecap and proceeds to thrust. most often fantasized about when lusting over an extremely attractive girl with extremely attractive legs.
oh man, i want to capfuck her.
מאת jake stephens, fida z. 11 במרץ, 2005