The act of penetrating a vagina or anus with one's hand, so deep that one's forearm is also partially entered. (portmanteau from 'fisting' and 'wrist')
A piece of furniture built for the sole purpose of manipulating the human body into an ergonomic position to receive a human fist into the bodily orifices
In a group larger than two, when one party makes a comment, and the remaining parties reach the samepunch line at the same time. Thus canceling out each others joke and leaving an awkward silence.
Guy 1: "Guy 3, what is the weirdest thing you have ever put your finger in?"
Guys 2 & 3, Simultaneously: "What was her name?"
"I've dated too many women to remember."
Guy 1: "... Would you two stop joke fisting, its making me uncomfortable."