When one has a flu accompanied by
fever and tries to fart. The result is usually liquid poop filled underpants. The term is a combination of
fever and
shart.
Ryan was sick with a fever for days, and when he
thought he was in the clear to let out a fart, he ended up fehrting himself.
"I thought I was over that flu, but when I tried to fart, I fehrted all over my self."
"I know. I can
see the shit
running into your socks."