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1.
When multiple high school freshman girls start to experiment with make-up around the same time. Overuse of eyeliner being used results in dark rings around the eyes, similar to that of the common raccoon.
Upperclassmen 1: "Holy shit! Do you see how much eyeliner those freshman chicks have on!?"

Upperclassmen 2: "Yeah, it's Raccoon Season"
by shreddingsociety November 26, 2010