Green’s Dictionary of Slang

1. (US campus) a superficial person; thus foofy adj., silly.

[1948		(con. c.1910s) J. Stevens Big Jim Turner 21: Oh, foof! Don’t talk like a fool, Wiley].
1961		J. Kirkwood There Must Be a Pony! 40: The old foofs!
1985		Eble Campus Sl. Oct. 4: foofy – stupid.
1992		Eble Campus Sl. Apr. 4: foofy – prissy, vain.

2. (Polari) in pl. the breasts.

2019

P. Baker Fabulosa 292/1: foofs breasts.