When you're drinking a beverage, and taking a piss, at the same time. So named after a technique to rapidly turn-around helicopters, refueling while the engine is still running, here you're "refueling" while "burning gas".
"Hold on man, I'm going to take a piss"
"Want me to hold your beer?"
"Nah, I'll just hot refuel"
"I went to go take a piss, and wanted a beer. Welp, guess I'm hot refueling this time"
The act of being finger-blasted while driving a car
"Hey look, the chick in the car next to us is getting an Average Nebraskan!"
"My buddy's a semi driver, he sees so many Average Nebraskans"