A commonly used adjective used to describe degenerates and creeps usually residing in the city of North Battleford, Saskatachewan. Can also be used to describe places and things as well. Possibly a cross between rubbish and grubby. People from other cities usually don't know what the word means but anyone from North Battleford knows, and probably has used it at least once to describe someone/something. If something is really rubby, it becomes rubbiest. It can also be used as a noun.
"That guy was so rubby. He smelled like pee and sausage"
"This house is so rubby. It's falling apart, and is filled with garbage. It's the rubbiest house I've ever seen."
"That guy drinking lysol is such a rubby"