wimp (n.) Look up wimp at Dictionary.com
1920 (but not attested again until 1960), perhaps a clipped form of whimper (cf whimp, 1540s), perhaps influenced by J. Wellington Wimpy, comparatively unaggressive character in "Popeye" comics.
wimp (v.) Look up wimp at Dictionary.com
1986, with out (adv.), from wimp (n.). Related: Wimped; wimping.