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To inflate somebody's ego via compliments, praise, or actions.
When the ego of a person is self-inflated.
Having too high an opinion of oneself when in actuality, it is unwarranted.
Don't gas up this idiot!

I would tell him he has nice eyes but I don't want to gas him up. He knows he's good looking as it is.

Amanda has almost 100 likes on her new Facebook profile picture and it totally gassed her up! Now she thinks she's hot shit.
by blattyblattybla September 13, 2013
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2
v: to fill another's head with false notions
She was all gassed up, so when she didn't win promqueen she was salty.
by George February 02, 2004
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5
In European slang, to "give up" someone during questioning (most often from government authorities), rat, snitch, tattle-tale, etc. Derived from Nazi Germany and occupied nations as "snitching" on Jews, as well as others targeted by the regime and those housing them, often resulted in those people being put to death via gas chamber.
"Who was your accomplice?!"
"Suck my dick, I'd never gas up anyone."
by alucardbuttfucksyourmom May 26, 2019
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