Top Definition
When girls wear a lot of foundation on their face and they do not blend it with their jawline, and a visible difference of skin tones makes the "tropic of foundation".
Friend #1: Wow, look at Megan's make-up... how much foundation do you think she uses?!?

Friend #2: I have no idea, but her Tropic of Foundation isn't helping at all...
by neemsay22 April 27, 2010
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