gutterbrain 

simply someone whose mind is in the gutter at a particular moment; someone who is preoccupied with sexually explicit thoughts.

- also, the condition of having your mind in the gutter; an instance where sexually graphic thoughts prevails in someone's mind.

"don't be a gutterbrain!"

"my friend, it seems you have a severe case of gutterbrain!"

gutterbrain by bonzai January 15, 2005

Gutterbrain 

A terrible disease that sticks your once perfectly normal(ish) mind into a dirty gutter, hense gutterbrain. It will make you think dirty all the time, make any sentense dirty, ect.

P.s. This disease is uncurable.

GOOD LUCK FELLOW GUTTERBRAINIANS.

Catrina and Maddy Have had gutterbrain since they found out where babies came from.

Gutterbrain by CondomPenis4Hannah<3 September 11, 2011

butterbrain 

A female who is super hot with a nice body and face, but is brain dead.

butterbrain = "but her brain"

Guy 1: Damn that girl is smokin hot!
Guy 2: Yeah but she's a butterbrain
Guy 1: Oh screw her

butterbrain by Makolyte June 26, 2009

butterbrain 

1.) (n) Someone who uses drugs regularly and/or habitually, esp. hard drugs (crack cocaine, heroin, methamphetamines, etc.)

2.) (n) A junkie or drug addict.

Called a "butterbrain" as the user's brain has been melted down or fried through constant drug abuse. This shows itself through a lack of rational behavior, thought process, and severely limited intellect.

1.) "Man, that dude has smoked so many rocks, he's just a butterbrain now".

2.) "That dealer down the block is always sold out from those butterbrain's buying up all his shit."

butterbrain by Paul W. G. June 27, 2007