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someone who fucks older women or men 20 yrs or older than them.
jennifer, Why are you fucking my dad?
Kim, Im a fossil fucker and I want to thats why.
by funny chick February 25, 2009
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A younger male who purposely 'hits on' older ladies (usually aged over 40 and single) for the purpose of sex.
Look at that guy hitting on that old woman - man, bet he's a fossil fucker!
via giphy
by Adolf Trump-Farage September 18, 2018
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