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To touch yourself or someone else in a way that could be deemed innapropriate sexually.
"Watch out for that Neil bloke he's a bit of a cock feffing rapist!"

"His hand were in his pockets and he was clearly feffing himself."
by Boneyemski September 30, 2009
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2
Fucking

Can also be used as Feff meaning Fuck, or Feffer meaning Fucker.

- Originated from Effing
Ashley's a Feffing fag!
Stop being such a Feffer!
by Shalinet February 21, 2008
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