What is Knees Up?
1.
A very informal gathering for any type of celebration. Involving plenty of impromptue singing, dancing, and drinking. Probably Cockney in origin.
On the night their exam results came out, they went down to the pub for a right old knees up
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when you are porking a babe and she says something that makes u mad so u turn ure condom inside out without her knowing, exposing the sp..
1.
Expretion of agreement, or meaning "who gives a fuck?"
1"Hey you used my toof brush to whipe yo booty, didnt ya'll?..