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A stemm is a gay/lesbian female who dresses like a guy, and dresses like a girl.
Person 1: Look at that girl, she looks like a dude with all those guy clothes on, she has to be a stud

Person 2: Well she was wearing girly clothes yesterday, so I thought she was a femm

Person 3: Actually she's a stemm, she's wears boy clothes sometimes, and girl clothes other times
by JenniferHill November 08, 2009