When a male inserts his penis AND testicles into the urethra of another male, causing the receiving male to have a "fat sack".
Guy 1: Honey,I want myself in you, but I'm tired of just anal
Guy 2:Okay, let's give me the fat sack.
Guy 2:Okay, let's give me the fat sack.
by Ballsballsballssack February 22, 2010
Get the The Fat Sackmug. by Lucyyfur June 21, 2005
Get the fat sackmug. by Lade1020 March 2, 2008
Get the fat sackmug. by Marvinhanovver August 21, 2009
Get the Fat sack of shitmug. by Georgiona November 23, 2007
Get the fat sacksmug. by Daddy Fat Sacks June 5, 2003
Get the Daddy Fat Sacksmug. by beanerinotaco34 January 29, 2009
Get the Fat Sack of Shitmug.