Green’s Dictionary of Slang

1. sexually eager.

1927		K. Nicholson Barker II ii: You hypnotized him into thinkin’ he loves you. Then when you had him all hot pants you married him.
1948		J.M. Cain Moth (1950) 213: Hot pants, cold heart.
1967		(con. 1940s) M. Dibner Admiral (1968) 356: Those poor little neglected hot-pants Navy wives.
1973		D. Williamson What If You Died Tomorrow (1977) I i: You had the hottest pair of pants in the colony.
1986		J. Ellroy Silent Terror 239: ‘[S]he's your prototypical hot-pants teenybopper with a yen for Italian guys and muscle cars’.

2. sexy, provocative.

1961

C. Cooper Jr Weed (1998) 229: You just take off that hot-pants dress and whore face.