Used over instant messenger by particularly smug (read: dorky) star wars fans that believe they are being quite clever by replacing "most likely" with "mos eisley". Typical response to such usage is one of confusion.
Jeter8276: happy hour tonight?
HolyLoral1: I'm in, Plugs?
Jeter8276: mos eisley
HolyLoral1: eh?
Jeter8276: sorry, most likely
HolyLoral1: you "mos eisley" need to get a life
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