Maltese slang for "Unbelievable" in a sense that you go fucked over when you were least expecting it.

Pronounced 'Prroooooooosett'
A door to door rug salesman was asked by a customer if he could come back next weekend when should could pay in full, and leave the rugs behind.

He comes back the following weekend

Customer: " who are you "

Rug salesman: " I'm here to collect the payment for the rugs "

Customer " I've never seen you before in my life "

Rug salesman: (bows forward and yells) " PROSETT! "
by The Camel May 19, 2022
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