A term used for somebody that is just sexually attracted to somebody. They just wnats to have sex with them, not date them or anything.
Guy 1: Look at that girl! She's hot, why dont you date her?
Guy 2: Nah, I'm just up onto her.

Girl 1: Wow, that guy stares at me! I wonder if he wants to date me?
Girl 2: I think he is just up onto you.
by Daschy September 19, 2009

5 Words Related to Up Onto

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