1. A plumbing term - cock flaps are the flanges within the mechanism of a stop cock that stop the flow of water.
2. Flaps for a cock. Not to be confused with Cock Flasps
I'm sorry Mr Jenkins, but your whole Cock Flaps assembly will need replacing.
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A womens beef curtains / labea / fanny flaps.
"I saw her naked the other day and her cock flaps were dangling like a large lettuce."
The manner in which a male's penis travels when walking if unrestricted by garmet(s). Only applies to biological men, "transgender" men don't actually have penises, despite the current narrative.
Girl at nude beach: Omg look at they's cock flapping in the wind while them slowly walks towards us! I am so going to suck it off!
Other girl: That's a biological male you dumb slut. And learn propper english you libtard.