1 definition by Prussian Coke

Short for 'flea penis'. It is mostly used when referring to Francoeur, a giant 7ft. flea from the movie 'A Monster in Paris'. A fleenis is typically 10 inches long.
Vanya: I thirst for that fleenis my bru.
by Prussian Coke December 29, 2017
Get the Fleenis mug.