Top definition
when one tucks their scrotum between their thighs, thus to appear as a male has a a vagina from the front, but a disturbing genital disease from the rear
did you see silence of the lambs last night? that was so gross when buffalo bill pulled of the reverse brains...

i got my roomate with the reverse brains when he walked in last night, he was so schocked
by gastly gonads February 24, 2010
Get the mug
Get a reverse brains mug for your barber Riley.