See
shank for root
definition.
Verb: to lift up your leg or ass cheek and deliver a rousing fart at the exact same
time as a loud noise, to avoid being heard, much like the lead character in The Shawshank Redemption hit the pipe with the stone during the storm.
I was at my girlfriend's
house watching a movie with her
parents, and I really needed to
shank one, so I waited until an explosion and shawshanked it perfectly. They never heard a thing so no one knew where the smell came from.