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the time when a close friend, family member, significant other or associate retaliates on you because of an unsettled disagreement that you two have, usually in the form of outright rage, sneak disses, or the sharing of secrets. One person thinks the issue was resolved a while ago while the other person isn't over it. Mad day is very sudden and unexpected to the victim.
Example 1: Why are you putting all my shit out there? What is this, Mad day?

Example 2: Yo girl going the fuck off.....you check IG? She been posting subliminals all day ..she must've caught you huh bruh? It's Mad day!

Example 3:

You: I came outside to my car and breh my windows was busted out and my gas tank full of snicker bars....yo i don't get it ..we broke up like 3 months ago breh!

Yo Homie: Yeah man but last night was her MAD Day.
by Yodmbass June 08, 2017
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