Jam Sesh

When at least semi-experienced musicians get together and pull songs out of their ass, working all together non-verbally. Almost always involves hilarious bullshit lyrics.

Good jam sesh last night man, way to pull that riff out of your ass

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Jam Sesh

A slang term used by douchebags to describe a jam session. Typically used by shitty/non musicians.

Hey man, wanna get together tonight and have a wicked jam sesh?

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Jam Sesh

Subconsciously dancing to a song then noticing that others are doing the same, which only makes the group jam more enthusiastically.

The Black Eyed Peas can usually entise a jam sesh.

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