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Does not mean an unfirm bottom, but it means a person who is very lazy
I had to fire David as he was a slack arse
by Windy28 September 03, 2009
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2
A word used for someone who receives anal a lot.
That girl Wendy over there, I heard the whole football team has put it up her arse. She must be a right slack arse.
by Yeahyea June 08, 2015
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