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1.
Getting hit in the nuts
O my God, that dude just gave me a knuller
by Dennis Lackey January 23, 2003
 
2.
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