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Short for "Mutually Exclusive Sexual Partner." You're not dating, you're not sleeping around. Similar to "Fuck Buddy."
When you only have one sex partner, but they are not your boyfriend/girlfriend.
Bridget has a cute MESP. Carrie tried to get with him, but Jim only does Bridget.
by Kerico May 05, 2007
long haired drug addict who appreciates good hifi
i see a mesp lying in the corner unconcious overther
by genesis April 25, 2003
A twnety something that likes to booze heavilly
ah mesp would you like some more meths with your cola?
by genesis April 28, 2003