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1.
When you have to hide a boner so you flip your dick up under your waist line to suffocate it. Most convenient when wearing loose athletic shorts.

JM&DO
Teacher: Jimmy! Your presentation is next!
Jimmy: Oh I'm fucked! My dick's poppin' out and there's nothing I can possibly do!
Jimmy's conscience: Cock noose it.
by Drew10293756102395876 May 26, 2007
 
2.
This is the practice of wrapping something such as wire, tape or some kind of material around a penis to restrict the release of fluids. Usually, someone will employ this tactic on a man's penis, and when he is about to orgasm, it will cause immense pain.
Stephanie caught Bill cheating on her, so she played like she didn't know. When they were about to engage in sexual relations, she gave him a cocknoose. He was about to cum, but then his penis blew up.
by Josh Amaral September 24, 2006