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TNI means "till next insight" used on many MMORPG's. Also meaning, how much experience till your next level?
Hey, how much TNI?
by CSTRIKEshogun August 19, 2003
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Tactical Nuke inbound

this means that a really fat human is coming ur way to bother u
look that TNI is coming our way.
by jokes alot April 06, 2011
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