an inverted nipple, as if the protruding part is actually pointed inside

Used in South Africa when you tweak a mates nipple normally done on guys. Girls get very upset if you do it to them. Normally done in a joking manner between mates when indulging in horseplay.

The Disabledness After getin Purple Nurpled

The extremely hard squeezing of the male nipple (usually)and then twisting until the person starts screaming like a pig and starts to cry because of the pain. This is because you have just crippled the shit out of his nipple.

To bite a chicks nipple to hard and end up hurting her

The same thing as a Titty Twister or even a Purpler Nurple.
When someone surprises you by twisting your nipple round painfully.

When you finish your after sex cig and put it out on the bitches/dudes nipple.