Any person who loves jism. Usually used as an insult, but can be used as mocking endearment to a lover.
1. Dude your a cocksucker, yeah thats right jism jockey!
2. Sally you are really great in the sack, your my little jism jockey.
Any individual who loves cum so much they would ride, much like a jockey does, a man's penis in order to milk every last drop of jism from it.
Michael B is such a jism jockey. Yeah he rode like the entire basketball team when he was drunk and horny. What a total faggot.