The act of using one's tongue on the anal rim of another person in order to gain and/or give sexual pleasure.
Insertion of the tongue is not necessary. Circular motions in the clockwise directions are supposedly better in the Northern hemisphere, and anti-clockwise ones in the Southern.
Also known as Trumping (named for the way Donald Trump's lips frequently form a suction cup while speaking), rimming is the act of licking or sucking another person's anus.
When the 'lads' are in the pub/bar, one of them goes to the toilet and leaves their pint on the table. Another guy picks up the 'absentees' pint and rubs the rim of the glass in between his foreskin and bell-end, when finished replaces the pint where it laid originally. You lie in wait for the victim to return, and then piss your selves laughing when he remark how shit the beer is!! Brilliant joke until it happens to you!
The method of supposedly sexually stimulating someone by licking their filthy asshole, or stimulating oneself by tasting someones poop on the tip of their tounge.
The fat hoe was rimming him when he farted and a poop smelling, whole kernal of corn popped out of his asshole and landed on her tounge.