step up on

To approach in an aggressive manner.
To get up in someone's face.
To act in a way that would warrant an aggressive response.

"I'm just waiting for someone to step up on me so I can just goooo!"

"Don't you fucking step up on me like that."

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Stepuponable

That of which can be stepped upon

Jack, "You stepped on my fucking Womens Digest you ass hole."
Peter, "Well maybe if it wasn't stepuponable it wouldn't get ruined."

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