Green’s Dictionary of Slang

bimbo adj.

crazy, foolish.

[US](con. 1966) P. Conroy Lords of Discipline 82: He panics, he flips out. He goes fucking bimbo.
[Aus]Bug (Aus.) 24 Feb. 🌐 But there’s a few pisspot bimbo sports journos who would give Laurie in La La Land a real run for his money.