a fucktion is referring to an event with a designated time and place for fornication.
Person 1: "Are you going to our high school reunion on Friday?"
Person 2: "I wouldn't miss that fucktion for anything in the world."
Person 1: "Oh yeah, I can't wait to see all of those divorcees... It's gonna be a high-class fucktion!"
When you’re too fucked to function you just can’t fucktion
“Man too many drugs in so little time I can barely fucktion anymore”
When you are fucking and your dick gets stuck. May be painful.
Julie and Melvin were fucking and got into a sticky fucktion. Melvin was hurting for the next few days
The man performed a fucktion he learned from his ex involving rolling and lube.
The opposite of function, a circumstance of being utterly unable to function and made so by multiple issues
As you can see, the office continues to fucktion entirely.