Top Definition
The act of shoving your hand up another's anus and tickling their insides while yelling "fisty biscuit!"
"Dude, my girlfriend wanted me to fist her last night, so I gave her a fisty biscuit!"

"I shoved my hand up this kid's asshole, then pulled it out and called it a fisty biscuit"
by John Hecklmeyer (Myth) November 27, 2013

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