think with (one's) little head(redirected from thinking with little head)
think with (one's) little head
vulgar slang Of a man, to make decisions based on one's sexual desires. "Little head" is a slang term for the penis. I know you're attracted to her, but stop thinking with your little head and consider how hooking up with my best friend would affect me.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.