What does Knees Up mean?
A party or dance. Often high spirited.
Other definitions of Knees Up:
A joyous celebration.
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How to use the term Knees Up:
We went to the pub for a bit of a knees up. Quite the night.
After the knees up, we went out looking for some trouble.
More slang terms:
Hit 'N' Run
Kinda sorta chuckle
as much as possible