When two woman scissor with a vibrator in the middle and both orgasm aggressively
"Tonight I crave a dirty fifi"

"I think I'm gonna ask my gf for a dirty fifi"
by Woman_lover111 August 1, 2022
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A blunt/spliff with only a few draws remaining.

Originated from, and commonly used in the South coast of the UK
Guy 1: Hey man, you want fi's?

Recommended response: Sure man, waste not want not =

Foolish response: Nah man, dirty fifi's are gash =\

by ethos_ February 24, 2009
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