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1.
any american car made in the world
I own an Excursion. It gets about 8 miles per gallon. It's a true gas guzzler
by J 0 K A September 24, 2005
 
2.
An vehicle that uses ridiculous amounts of gas and emits even more crap out of its exhaust. Is not limited to cars, can also be used for scooters and motorcycles.

Adjective form is gas-guzzling
"Dude, what's all of this smoke?!"
"We're driving right behind a gas-guzzler with open window, Captain."
by Fabio Italiano December 31, 2009
 
3.
A person who vehemently enjoys ingesting farts in order to achieve sexual pleasure
After accidentally farting in Tom's mouth while he was giving her a rimjob, Mary discovered he was a gas guzzler
by archer20267 November 17, 2013