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1.
proper dirty flirt/ing
i aint seen flith like that before, sub-human nasty business.

she was flithing big style
by Mr Bo Jangle August 07, 2006
 
2.
Frivolously Filthy
Guy: "speaking of ass, I'm starving!"
Guy 2: Dude, that was flithy.
by Kamo83 July 28, 2008