similar to the word jawn, except used to get a reaction from people who aren't familiar with the term. u get em, and sometimes they are valuable, and sometimes they're not.
me: aww man instead of my paycheck I got a coupon for fivefree flenises.
him: what... what is that?
me (yelling across the lawn): yo edmond, remember to bring the flenises!!!
him (yellnig back): what.. what the hell are you talking about?
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.