The reserve of sexual images or thoughts used for masturbation. Similar to a gas tank, but imaginary and naughty.
by Stumanji September 1, 2010
Get the spanktankmug. by BATTLE LION1337 December 3, 2007
Get the spanktankmug. When you slowly and continuously fill a fish tank with your semen, take a microscope, and watch the dead sperms float around.
Tyler: Yo dude have you been filling your spanktank.
Vincent: Yeah mang it's filled to the brim with my little swimmers.
Vincent: Yeah mang it's filled to the brim with my little swimmers.
by Davy MF Jones December 14, 2022
Get the Spanktankmug.