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1.
the testicles where sperm is produced when are large or huge
-yesterday i saw my father naked in the bathroom, not much of a cock indeed but he's nuts are the size of golf balls!

-gross...you have a dad with sperm tanks!
by urpapi October 04, 2010
 
2.
A girl who enjoys swallowing huge loads, often more than one in a sitting. She can be identified when she asks you to pull out and go in her mouth.
We were having sex and when I was ready to go she pulled me out and had me go in her mouth. Man what a sperm tank.
by Yigal November 26, 2004