Gassing, is when you stop at a gas station near midnight when its dark, pay for $100 worth of gas, but the catch is you don't put it in your car, you shove the gas nozzle all the way up your ass. Then you pull the trigger and let that $100 of flammable gasoline flow up your ass
"Dude I was gassing myself so much last night!"
Complementing what you hear in your reality in order to make sense of it
To kill a lot of jews (or normies, see WW1.
Hans! You aren't gassing enough jews, if you don't move I'll call Gestapo!
To be completely exhausted of all energy after an intense workout; or several bong rips
That last gym session had me gassed out; I’m ready to go home.