noun. A rock band whose performances include long, unscripted, meandering segments which experiment with structure and sound. Jam bands typically play very long sets whose playlists are only vaguely defined by lists of "songs." Jam band fans often heighten their musical experience by taking hallucinogenic drugs or by smoking pot. Examples include the Dead, moe., Phish, Widespread Panic, String Cheese Incident.
moe. is a jam band.
Q. What did the Deadhead say after the acid wore off?
A. This band sucks!