Origin of rocker
- an ice skate with a curved blade
- the curve itself
- a figure consisting of three interconnecting circles
- a half turn in which the skater turns through 180°, so facing about while continuing to move in the same direction
"a rocking chair," 1852, American English, from rock (v.1); earlier "nurse charged with rocking a cradle" (early 14c.). In sense of "one of the curved pieces of wood that makes a chair or cradle rock" it dates from 1787. Slang off (one's) rocker "crazy" first recorded 1897. Meaning "one who enjoys rock music" (as opposed to mod (n.1)) is recorded from 1963, from rock (v.2).
off one's rocker
Also, off one's nut or trolley. See off one's head.
see off one's head (rocker).