A "sexual aid" used at the base of the penis, usually made of leather, which serves the dual function of both constricting blood flow for hardness as with the use of a "cock ring" and also as a "penis bib" of sorts, protecting the cock and balls from unwanted fluids as when engaging in anal sex or copulation with a menstruating female.
Ahh Dude! I got to the party so late, like 6 other guy's had already boffed Jenny, so I had to use my "leather donut". I think the chick may have been on the rag anyway.
by Conrad Duquesne May 29, 2008
Get the Leather Donutmug. 
by slickrikki January 5, 2008
Get the soiled leather donutmug. by nick March 8, 2004
Get the tangy leather donutmug. by dick starbuck March 30, 2004
Get the brown leather donutmug.