Someone who is not quite yet a bro, but almost certainly will be after just one more party or gathering of the bros. Also used for females, from greek demeter and demi, a feminine prefix, to denote a female who is close to the bros.
1) "That John is a real bro"
2) "Nah, I dont know him, he's more of a demibro"

"Man, I'm glad Emma's here, she's a real demibro"
by Chad Bro Chill 663 August 03, 2008
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