To switch places with another person or thing in a swift manner, in any given situation. Can also apply to quickly switching any given item with another.

someone who is sexy beyond mean

When two men ejaculate into each other’s mouths and start making out.

The act of pooping, from one anus to another, with direct contact. Also known as "pooping back and forth".

When a women dates a man, and dumps him for his twin brother.