1: The act of grinding one's body against another for sexual pleasure with clothes on.
2: The less known definition of applying a texture to a piece of paper through rubbing.
1: Man, Jill and Becky have been dancing for a while now. Probably engaging in some hot frottage.
2: This is the most splendid texture! Watson, give me my frottage tools so I can make a rubbing.
To induce a sexual pleasure by applying one's body to another's. The process may occur in an undulating motion or during general perambulation. The process is especially popular at music concerts and at night clubs see moshing.