It means Forever 21 in girl terms.
Girl: Hey! Wanna go to XXI with me?
Girl 2: Sure! I need new clothes anyways.
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XXI is a badass gaming group. Don't mess with them or you'll be pwnd silly. The XXI's specialize in wifi games such as Super Smash Bros. Brawl, Pokemon Diamond/Pearl, and many others.
"Don't mess with XXI or you'll be pwn'd silly."
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Force 21
A revolutionary new type of training program being experimented with by the US Armed Forces, particularly the Army.
"Eventually when youngsters grow up to join the Army they'll be put through the Force XXI's VR simulations and stuff. It sounds better than live exercises, but is it good enough to train soldiers via videogames? Maybe, maybe not. I like videogames though. ^_^ "
-me
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