2 definitions by allen powell
It's when you grab the skin between your hanging balls and your cock and then tighten your grip all the way up to your balls forcing them to really stick out, this makes your sac look veiny and bumpy like the top of a brain.
I asked my girl to examine a spot in my testes, when she came in for a closer look, I tightened up my grip and hit her in the eye with the brainer.
by allen powell January 17, 2006
when a girl is giving head and the man squeezes her head with his thighs and blows a hard fart in her face,this causes a thunder-like rumble also giving the girl a face full of fecal mist.
by allen powell January 12, 2006