Where one goes into a bathroom and brings their toy figurine of shrek along. They then proceed to run themselves a bath whilst preparing to shit on everyones favorite character. Once in the warm bath tub they shove shrek up their ass and shit on him whilst hes up there (jammy bastard). They then take him out of said ass and gives him a swirly. After all this the owner of the toy licks shrek clean.
That legend Joe did the slippery shrek the other day and apparently he wants to try it with friends