That massive vein that runs on top of the penis. If used right could cause a hurricane.
Whenever I take a piss I can't help but notice that massive power vein.
by Drpun May 22, 2009
the vein that runs from your bicept up into your pectoralis major
mike doesn't have a power vein
by E-Rock April 29, 2005
teh big ass blue vein in my Johnson
Dude, my power vein is ginormous
by da ali g July 31, 2006