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knuller -s, -ing (also chnuller)

1. a person who have casual sex with anyone at anytime.

2. Two persons living together just for the sex, without any other commitments
1. Lisa is such a knuller! She goes to bed with anyone!

2. George and Jennie are not married! They are just knullers!
by Roffe May 16, 2003
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