A snug-fitting, typically black, leather jacket of a type worn by motorcyclists, often having an asymmetric zip closure; a fashion jacket in a style resembling this.
Origin
1970s; earliest use found in The Oakland Tribune.
Definition of biker jacket in US English:
biker jacket
noun
A snug-fitting, typically black, leather jacket of a type worn by motorcyclists, often having an asymmetric zip closure; a fashion jacket in a style resembling this.