1 definition by fist_of_justice

Top Definition
stands for Bikini Training Time. The period before the summer when women try to diet and slim down so they look good in their bikinis.
Allison had put on a lot of weight during the winter, so she had to do some BTT.

I can't eat those chocolates. It's BTT!
by fist_of_justice April 14, 2009
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