Top Definition
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!"
di For Whom the Bell Trolls 12 giugno 2006

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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
di HaileyM 02 gennaio 2010

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A band based on one of the founding member of the Grateful Dead, aka Bobby Weir. While the line up changes from time to time, Bobby remains the key and cornerstone in this band.

The band plays a few covers, a few new, and a lot of old Dead toons. The band still commands the following of a cult group known as Dead Heads.

What a long strange trip it's been.
Ratdog see also: Grateful Dead, Ratdog, PnP, aka Phil and Friends, Planet Hart, and other Grateful Dead legacy bands and spin-offs.
di das loon aka loontoons 01 marzo 2006

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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!"
di AA Factory 10 giugno 2005

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This is a word used by some people living in deep western suburbian areas of victoria. To call someone a ratdog is to offend them, used by someone known as awestie
"You fucking ratdog cunt, i'll snap ya."
di xfhasdf 20 giugno 2006

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The term used for when someone does an unnecessary or lowly act.
"John cutting in front of the line is ratdog."
di Isaaaaaaaaaaaaabelllllllll 18 marzo 2008

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crazy little dog.
a crazy little dog that chews up to one thousand dollers a month.
di fatoni 06 febbraio 2003

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