What is F.i.b.?
1.
means "friends in bed"; another term for 'friend with benefits' or a nicer way of saying 'fuck buddy'.
friends who have a causal sexual relationship.
Soup is a most agreeable f.i.b.; he comes over, we fuck until we're both satisfied and then leaves.
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2.
Finger in butthole-- The act of putting or pretending to put a finger in a butthole. Self Examplantory but i have to use 20 words because of urban dictionary law.
When u poke someones butthole you say "F.I.B.!!!!!"
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