the act of sitting in a chair at work (after a large lunchtime meal) turning into a bucket of lard.
"Wow CeCe I really feel like I'm getting fat at work after I eat lunch and sit in a chair all day with minimal movements." "Don't worry Annie, you are just larditating."
Lardfist - verb (-ing, -ed). In verb form it is the act of dipping one's hand in lard and then inserting said fist into the rectum of another person. This was first reported in the movie Caligula (1979). Colloquially, it denotes any instance in which you are defeated by another person.
I got lardfisted this past weekend by Jerry, and I've been shittingbutter ever since.