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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.
Phish has super long jam sessions.

Dude Bill and I had a 35 minute jam session last night.
by Chris February 07, 2005
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Mar 1 Word of the Day
One who has a mania for music.
I am a melomaniac.
by Larstait November 14, 2003
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2
When a group of bros take turns having sex with a jar or squeeze bottle of jam or jelly (preferably squeeze bottle). Can substitute marmalade as well. No preserves for fear of chunks in urethra.
I got together with my old college roomates this weekend and we had a solid 2 hour jam session.
by The Real Wiz 76 July 16, 2016
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3
a gangbang of sexual intercourse with 4 or more guys on one girl.
That bitch is sick she had a jam session with 6 guys
by Anonymous July 14, 2003
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4
When u listen to music and dance to it with more then 1 person
by krista January 04, 2004
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