This Victorian phrase means 'don't lie to me'. In the 1800's, it was common for dog salespeople to try to pass mutts off as pedigrees. This is supposedly the origin of the phrase (which was popular until the 1870's).
“You think I'd believe that you're a wizard who's also the cousin of royalty and Bill Gates' twin brother? Don't sell me a dog.”
by C L G January 31, 2021
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When your favorite/least favorite nascar driver is either running multiple laps down, is out of the race due to a crash/mechanical failure, or when a driver is suspended
Dude, (insert driver name) went 5 laps down. He might as well start selling hot dogs if he's running this bad, lol
by Ayeskipp October 23, 2022
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One who fumbles/sells the bag, effectively killing the vibe-- One who messes up and other people have to suffer the consequences.
"Come on guy you didn't bring the carty*? You're being a sell dog."

*See also, "carty," a cannabis cartridge.
by bootyhandled January 12, 2022
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