jam session
1. slang An informal or impromptu gathering of musicians in which they play unrehearsed or improvised music together. I love this bar. A lot of talented musicians hang out here having jam sessions nearly every night of the week. Let's just have a little jam session and see if we've got the chemistry to make a record!
2. slang By extension, an informal or impromptu discussion or debate. The boss said he wanted to have a jam session with everyone to get to the bottom of the recent production problems. Toward the end of dinner, we all just started into a really wild jam session about the nature of consciousness and reality itself.
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