Green’s Dictionary of Slang

wilma n.

[the character Wilma in the cartoon (1960s) and film (1994) The Flintstones]

(US campus) an ugly, stupid woman.

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[US]Eble Campus Sl. Spring.
[US]Eble Sl. and Sociability 92: The Flintstones [...] provided the noun wilma for ‘a female who acts stupid.’.