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Mad par means a party so wild it makes your brain feel like it's been hit by a brick. Par is short for party, and mad means it's out of control.
Yo, we had mad par last night. I woke up with a hangover and a tattoo I didn't ask for.
This concert was mad par. I didn't know the drummer had a side hustle as a magician.
My cousin's birthday was mad par. The cake was on fire, and the pizza had a personality.