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When you are shafted, done over, ripped off or stitched up for no apparent reason or benefit to either party
God dam it! I was just finned!

Did you just fin me????

Don't fin me, man!
by Ming the-Merciless June 03, 2009
when Jonathon Loughran gets owned by Mark Finn, hence the definition "Finned"
Jonny got Finned TBFH
by Ross Leightley March 21, 2007