A receptive homosexual partner (or "bottom") who also has a fetish for dressing up as a baby (i.e using baby powder on his bottom).
"Yeah, I went over to his place last night. He was hot, but then he asked me to change his diaper."
"Sounds like a powder bottom."
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A Gay Male, typically a Bottom or someone who bottoms, on or with the intentions of getting cocaine.
Girl, that tired mess is a powder bottom. Powder comes out, legs go up.