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

by Lucyyfur June 21, 2005

by Lade1020 March 02, 2008

by Marvinhanovver August 21, 2009

by Georgiona November 23, 2007

by Daddy Fat Sacks June 05, 2003

by beanerinotaco34 January 29, 2009
