A circumcised penis.

When your penis is half hard and half soft. Morning wood is technically a type of half cocked because it isn’t quite a full boner. When ones dick is half cocked the split stream is very much common. And, being half cocked always seems to sneak up on you when you don’t suspect it. Like at school or even at church.

Half cocked = a flacid boner

The state of your cock being neither limp nor hard, but in the middle.

An insult towards half cocked people, who sometimes are vagina monsters.