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1. Eating greasy foods a day after you ordered it when its sitting in your fridge or something

2. A Gross ex girlfriend or boyfriend that you regret ever coming into contact with and you see a friend of yours dating such person.
1. Man youre really eating that 2nd day grease, you gross fuck

2. Man you see Joey with the 2nd day grease? Fucking gross
by Youreaverageasshole May 26, 2018
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