Knobcrust 

The crusty stuff around an unwashed penis. Knobcrust is used as a uncommon insult.

Fred, you knobcrust.

Knobcrust by Stephen Watson 89 January 4, 2008

knobcunt 

Knobcunt, a person who is a bit of a div and disrespectful in general. Usually the person in the club that is a complete liability that everyone tries to avoid!

Don't invite him to the party, the guy is a proper knobcunt!

knobcunt by Kane LAKUK June 3, 2018