when your brain is nothing but boob filled thoughts.
Jeff: Sorry I can't have a serious conversation right now, I'm boob brain at the moment.
by petal_power September 26, 2015
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When a girl is super attractive but really dumb, usually has big boobs, lots of make up and is very dimsighted.
Guy 1: "hey did you ever get with that girl?"
Guy 2: "no man, she has boobs for brains, I couldn't even have a normal conversation with her"
Guy 1: "that blows.."
by maccaronitoni November 18, 2014
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