This means when a whole bunch of musicians get together play some chords for about a minute saying random lyrics and then go on playing for 19 more minutes.
by Chris February 7, 2005
 Get the jam sessionmug.
Get the jam sessionmug. Person 1: I'm playing animal jam with my friends
Person 2: Dude stop playing Anal Jam it's for little kids
Person 2: Dude stop playing Anal Jam it's for little kids
by DrCookie June 30, 2016
 Get the Anal Jammug.
Get the Anal Jammug. by elvis June 27, 2003
 Get the Pearl Jammug.
Get the Pearl Jammug. by YourSaint December 24, 2008
 Get the jammug.
Get the jammug. by Very Smart 1234 October 30, 2018
 Get the My Jammug.
Get the My Jammug. by LowLight May 14, 2009
 Get the Jobby Jammug.
Get the Jobby Jammug. 