To be perverted in some way, another way of saying sick bastard.
Wow L-Nic is a sick dog!
by Jonathan Dack October 23, 2004
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Used as a substitute for "cool", "awesome", "wicked" & mostly used by violent, alcoholic head chefs.
Bro 1: "Bro! I just did a frontside 360 heelflip!"
Bro 2: "Sick dog barrels!"
Bro 1: "What?"
Bro 2: "Sick dog barrels!"
Bro 1: "Right...."
Bro 2: "Sick dog barrels!"
Bro 1: "Shut up."
by manllama November 22, 2011
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People often associate a sick dog with eating grass and vomiting globs of whatever.
I drank too much last night and spent an hour with my head over the toilet bowl, sick as a dog!
by talk2me-JCH2 June 20, 2023
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Term for being incredably under the weather. Often used when trying to get out of something such as work or school.

The term came to be because dogs are notoriously constantly ill.
see sarcasm
Fred: I can't come in to work today, I'm sick as a dog.
Jane: Too bad... have a nice trip to the beach!
by Dame ZNEK January 5, 2009
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Very fucking ill. Like how dogs poop and puke everywhere.
Dude, I'm dog sicks right now
by MilkmanMilkSteak January 5, 2013
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