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A creepin' is when some ugly, creepy dude or lady is lurking around trying to be stealthy, but they're so bad at it that even your grandma notices.
He was trying to sneak up on me at the mall, but I saw him from the corner of my eye.
She stood behind me in line at the coffee shop like she was trying to scare me.
He was following me home, but he tripped over a dog and fell in a puddle.