2; a projecting part, usually round, forming the handle of a door. Symbollock of a swollen testicle. From the latin <i> swoolen testicle a knobi</i>
3;Now this one is a bit naughty kiddies. Is also a slang term commonly used to refer to the male genetalia.
2. Also can be used as a term similar to goof, tool or moron.
2.Dude, did you hear Bill locked the keys in his car again - what a knob!