One who constantly steps over "the line" whatever that line may be. This has the effect of forcing you as an observer to set him or her straight with physical force or the threat of physical force.
RICK JAMES "Charlie Murphy!!! (punch to the head, leaving a mark)
Then Charlie Murphy proceeds to kick Rick James' ass because he's gotta check that shit so it don't happen again, forcing him to stop being a habitual line stepper.
An individual who has crossed certain social boundaries, i.e. "the line". Typically this individual is a "habitual line stepper", or one who fails to recognize standard social norms and mores dictating proper behavior in public and in matters of social interaction.
A sassy woman with an exceptionally large and saggy butt, much like an old and rotting bell pepper. She usually waddles around wherever she goes because of her large behind, but she somehow still manages to get everyone to listen to her.
Tammy is so freaking bossy! She shuffles around the office with that ginormous, baggy butt, and thinks that she is the queen of the universe. In all honesty though, she's nothing but a bell pepper booty stepper.