Thunderfist
A drunken rock and roll band from Salt Lake City. Known for hilarious live sex acts onstage and random food eating contests during their shows. The name is derived from a German pornography magazine depicting a hard punch to the back of the head while ejaculating in a person's anus..
Did you see Thunderfist last night? How can they get any more fat?
Thunderfisting
The action of fisting a persons anus so fat that they fart.
"Bro I was thunderfisting Joyce yesterday."
"How loud was it?"
"85 decibels bro"
"How loud was it?"
"85 decibels bro"