Green’s Dictionary of Slang

wendy n.1

[? Wendy, the ‘goody-goody’ daughter in J.M. Barrie’s Peter Pan (1904)]

(UK juv.) a school child (of either sex) who has been rejected by their fellows.

Urban Dict. 🌐 wendy a wimpish girly boy who cries all the time. that ashley is such a wendy.