purple throb

when all of the blood inside a partially erect penis flows to the tip, enlarging it to unconventional proportions, turning it purple, while throbbing to your pulse; while the rest of the penis, see shaft, stays normal size

"bro what the fuck! my tips turning purple, and i think its gonna blow!"
"shit guys, we got a purple throb"

by thegrandmalik22 October 22, 2009

purple throbbing hard-on

a big purple cum filled boner ready to explode.

d00d ive got a purple throbbing hard-on and im gonna bust all over your face!

by rottenjohn11 April 16, 2010