Describing someone who has the physical attributes of marfan's syndrome, including but not limited to disproportionately long fingers and having a long and very slender build.
Person 1: Yo why is Mark so skinny? Doesn't he eat like 5 meals a day?
Person 2: I heard it's because he's marf'd up.
Person 2: I heard it's because he's marf'd up.
by comfortedreality February 8, 2023
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