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(For the men) When you are done fingering a girl (in the vagina, in particular) you have her spread her legs so that you can write your name either on the side of it or just above it using with her... juices as ink and your finger as the "pen." So then you have officially "registrated with that vagina.
"Oh my god, Jake totally registrated me last"
"Lets hope he spelled your name right"
by rulisaperv August 30, 2011
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