Top Definition
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!"
by bonzai January 15, 2005
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.

Catrina and Maddy Have had gutterbrain since they found out where babies came from.
by CondomPenis4Hannah<3 May 23, 2011
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