Knob referring to the male anatomy (the penis)
Jocky refering to a racing horse rider.
Knob Jocky would often refer to a person who is said to "ride" a Knob. It is often used to put someone down but in a more jovial way. More widely used in Australia, particularly Adelaide, Australia.

Literally everyone, ever. Including the writer of this definition.

Idiot; someone who rides a penis like a it is a horse

alexandender waterlander

Someone who is gay, a mincer, up hill gardener, faggit, you get the picture.