1 definition by J Dude
when after jacking off for a long time or having sex for a long time and you finally cum and the load that you blow is so immense that you can feel your sack emptying out leaving the skin of it so tight that it constricts around your balls leaving your sack looking like a brain.
Dude i sobered up halfway through and saw how not hot she was and it ended up taking me so long to finish i definitely had some brain drain.
by J Dude June 18, 2010