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1.
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.
by Cock Flasp August 21, 2006
 
2.
"I saw her naked the other day and her cock flaps were dangling like a large lettuce."
by unclechicken May 02, 2010
 
3.
A hybrid of cock (penis) and flap (labia). Obviously in this masculine context, the 'flap' component takes on a new non-specific connotation, though probably equates to foreskin.
Used as a term of abuse: "You total fucking cockflap!"
by Harry Garry Larry Barry Parry October 29, 2007