hot pants n.
1. [1920s+] (US) strong sexual desire; often as have hot pants for.
2. [1930s+] a sexually eager woman; occas. man.
3. attrib. use of sense 2.
4. [1960s–70s] (US) extreme keenness.
5. [1960s+] a term of address to a sexually eager woman (or one who is seen as such).