from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To publicly rub one's genitals against someone for sexual gratification, especially without the other's consent or knowledge. (In this sense it is related to frotteurism and not frottage.)
- v. To rub, chafe.
- v. To work leather by rubbing.
- n. A non-penetrative sex in which two males rub each other's penises.
from The Century Dictionary and Cyclopedia
- A variant of frote.
From Old French froter ("rub, polish") (Wiktionary)