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Term used by claregalway gang, describes something bad of negetive.
“What do you think of my new shoes
“They are mustan

“Got detention today”
“That’s mustan”
by PSG6996 December 28, 2018
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U Nobel warrior from the 15th century in the Arabic peninsuila who will do anything to reach their target
Wow, he just finished the math text book in a day, he's a mustan
by Arbrim January 14, 2018
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