A Creepin
A creepin' is when someone is sneaking around like they're trying to rob you or kill you, but they're too clumsy or dumb to do it right.
He was trying to mug me in the alley, but he tripped over a trash can.
She was sneaking up on me like she was trying to scare me out of my house.
He was hiding behind a bush like he was trying to jump out and scare me.