Green’s Dictionary of Slang

fleas and ants n.

[rhy. sl.]

(US) pants, trousers.

1935		A.J. Pollock Und. Speaks.
1949		Monteleone Criminal Sl. (rev. edn).
1953		Berrey & Van den Bark Amer. Thes. Sl. (2nd edn).
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.