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Adjective, usually has disgusting or pathetic in front of it. Really rude.
Omg she is such a pathetic rat-dog!
Any animal of the Canine species that fits into a standard sized microwave.

Yapping, whining, biting ankles, and fitting into small purses are common amongst these animals.
KellEy: Check out my new puppy! She's a Chihuahua Yorkie mix.

Hailey: It's cute now, but just wait until it becomes a full-sized Rat Dog...

*KellEy hits Hailey
Rat Dog by HaileyM January 2, 2010
A very small dog, usually less than 10 or 15 pounds, usually short-haired but not always. Usually not of much practical use as a watchdog or protector, but kept mainly as a companion by little old ladies, gay men who don't like cats, and Paris Hilton. Includes such breeds as the Chihuahua, the Miniature Pinscher, the Rat Terrier and other similarly sized breeds.
"That rat dog is 3 years old and he isn't housebroken YET?"

"I swear, if that rat dog tries to bite me again, I'll stuff him in a sock and hang him up as cat bait!"
A insult people would use on people that looks musty, dirty, or messy.
Did you see Carson today?? He looks like a rat dog lmao.”
Rat dog by Davae06 November 5, 2021
n. hot frankfurter (of unknown origin), wrapped in bacon, eaten in a long roll with grilled onions and peppers at 2:00am after the club.

The profiteers of these rather disgusting snacks set up outside of Los Angeles clubs, waiting for drunk patrons. They are notorious for cheating wasted customers of their change.
"Yo bitch, gimme my change...I ain't paying $10 for dis fucking rat dog!"
Rat Dog by AA Factory June 24, 2005
adj. when something, someone or an occurance is cheap, tight, mean, unfair etc. its rat dog. it can also be simply put as 'rat' or 'dog'
did cindy kick paul in the nuts? thats rat dog!
Rat dog by Y2JiB August 3, 2008