1. The mildew, fuzz, cheese found on the exterior of ones penis. Usually due to lack of cleanliness or wearing the same underwear for a week.
2. Similar to toe jam
3. Jessica's nick name
Porky: "OMG he had the worst shmagg ever!"
Shmagg: "Thats disgusting"
by porcupine May 30, 2005
Get the Shmagg mug.