What happens when wipeing your ass too hard and punching a hole in the paper.

Sticking your finger(s) in or around your anus, just enough to get a poop smell on it. Then, putting your "stink finger" up to someone else's nose, forcing them to smell the poop.

sticking your finger in ones vagina/anus, or in one of a slut.

A lot less simple than it sounds. This maneuver requires the insertion of one or more fingers into a vagina for a variety of reasons.

a: To prepare for love making.
b: To check for disease and smell.
c: Manual stimulation.

Once insertion is achieved you discreetly hold the perpetrating fingers under the nose and sniff them for danger. If all is well it doesn't smell.

the odour of a finger that has been scratching ones bottom whilst asleep usualy wiped on pillow by wife whilst asleep

to insert ones finger in bum and wype under enemys nose

also called "stank fanger"
When one places any number of any fingers in someone else's asshole.
Can be used in multiple combos for huge points with pink fingers. also "pank fangers". Pink being the fingers inserted into a vagina.
When one throws up his pinky and his pointer and inserts one into the anus and one into the vagina, this is called "one for the pank, and one for the stank"