A Steppin' Razor is a dangerous person that is not to be messed with, referring to the fact that they are quick to fight. Its origins are unknown, but the term was popularized by the song Steppin' Razor, written by Joe Higgs and recorded by the popular Jamaican Reggae band The Wailers. A number of covers of the song and references to the term have appeared since.
trying too hard to be something you're not, and using a thinly disguised method to do it; someone who is a phony; an imposter; faker; bullshitter; a charlatan; A person who makes elaborate, fraudulent, and often voluble claims to skill or knowledge; a quack or fraud;
"he ain't nothin' ... he be half steppin'
Afro-American origin; early 1960s; jazz musicians would criticize a player who obviously had no talent or originality, who would try to play "hip" lines on his horn a half step outside of the key, in an attempt to copy master jazz saxophonist John Coltrane. Ex: "he ain't playin' nothin'.... he's just half steppin'.... (i.e., playing musical melodies momentarily a half step out of the key to create harmonic tension resolved by moving back inside the key, a cheap imitation of the real thing).