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.