When two menstruating females scissor in a semi-rough bumping fashion to combine their blood together to become "moon sisters". The sexual woman form of becoming blood brothers. Receiving pleasure from a close friend by swapping and conjoining nectars. Constant same-cycling moon sisters become perma mooners when two women believe their spiritual closeness is derived from their blood bumping.
"Yo, my girlfriend been out all night with her friend prob blood bumping or some shit because they think they bff's. Lesbians.... its wack."

"Me and Susie are so synched we might as well be blood bumping."

"I've been blood bumping for so long we're perma mooners; Susie and I can tell each other anything."

"Can I get HIV from blood bumping?"
"Yes."
by Pooma Moomas January 08, 2014

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