Definitions of rocker:

noun: a curved support that permits the supported object to rock to and fro
noun: an ice skate with a curved blade
noun: a trough on rockers used by gold miners to shake earth in water in order to separate the gold
noun: a teenager or young adult in the 1960s who wore leather jackets and rode motorcycles
noun: a performer or composer or fan of rock music
noun: an attendant who rocks a child in a cradle
noun: a chair mounted on rockers
name: A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #16751)