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this means, bestfriends that kiss. this acronym was invented by th bftk's of all time, kristyn and chelsey.
Person 1: "whooa, those two chicks were so hammered last night, and made out."

Chelsey and Kristyn: "uh yeah, we do that all the time. we're bftk's."
by smiiilebaby. February 12, 2009
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