Definitions by BSC

marto 

to go bright red when it has been widely broadcast around an office that you have been having sex with colleagues on company property, especially the company showers - from the posh pronunciation of Tomato.

Also from the individual most likely to have committed the offence (J Marto Martin).

"Man - that dude from accounts is marto - he was doing that bird from marketing in the company showers and the cleaner caught him"

marto by BSC November 3, 2003