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1.
When a girl has the flu then deep throats your cock and it comes out with a string of slimey flem all over it.

The proper term for a penis with flem on it is a fleenis. This can also be used as an insult.
guy1: maaan she was sucking my dick and i cummed without feeling anything.

guy2: did she have any illness at the time?

guy1: yeah she had the flu, why?

guy2: OH MAN that's totally not semen, she gave you a flemdick!

fleenis example...

Guy 1: Your such a fleenis haythem.
by punching lions in throats September 07, 2010