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The left over beer in the bottom of a glass/can/bottle that no one ever wants to finish.
Friend- "Dude, there's still some beer left in this bottle!"
Dude- "Neh, that's just the mices. Spill it out!"

Friend- "Yo, finish your mices!"
Chick- "But it's flat and gross!"

Me- "Come on guys! Stop wasting your mices! There are sober kids in Africa!!!"
by Allie "Belle" Katt January 18, 2014