What is Step Off?
1.
You would use the term when you think it would be in the be in the best interest of the party/s or person/s confronting you to leave and/or leave you alone. It should be stated with feeling.
You best step-off,
mother fucker !
2.
Church for gangsters.
"You better go to Step Off and pray"
See
3.
back away from a confrontation.