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Someone who has identified as a bisexual for some time but has had no experience with someone of the same sex.
"She's only ever been with guys" "She's just a baby bi"

"I want to fuck that guy but I've only ever been with a girl" "Everyone was a baby bi once"

"She's totally into girls but is a baby bi. Show her the ropes!"
via giphy
by Grandfather Maggot January 23, 2018
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