1. A cock that looks deceptively small, but once it's full sized can create a river of bludge.

2. A man who manages to consistently convince women he's sensitive, and predictably turns into a bastard when he has slept with them.

when a man stuffs a sock in his pants or wears a cup to impress women with his penis size he has a decepticock. Usually linked to a man with a tiny penis.