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It’s a legendary insult from Urdu and Hindi that means you want to shove your cock up your mom’s ass. It’s also the perfect way to make someone lose their mind.
My cousin said 'maa lun' to my brother because he spilled soup on his shirt.
I texted my ex 'maa lun' when he asked me to come back.
My teacher yelled 'maa lun' at me when I drew on the whiteboard with a marker.