other head(redirected from their other head)
vulgar slang The penis as a source of a man's impulses or decision-making (as opposed to the brain in a one's real head). I know you're attracted to Sarah, but stop thinking with your other head long enough to consider how hooking up with my best friend might affect me.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.