Green’s Dictionary of Slang

crusher n.2

[SE crush/ crush v.2 (2) + ? masher n. (2)]

(US) one who persists in making unwanted advances to women.

[UK]Indep. Rev. 17 Dec. 13: He still looks more like a crushee than a crusher.
[US](con. 1962) J. Ellroy Enchanters 388: Carole Landis [was] an example of a ‘neophyte crushers’s crush’.