A large iron pot.
It is used for boiling food inside.
It is often used in fiction by Cannibals and Witches.

when someone appears to be pregnant due to food consumption and makes a sound like when you put a new 5 gallon bottle on the arrowhead dispenser

One of the craziest sex acts (if you can call it that!) known to man. What you need is a taker (cauldron) and a giver (male). Once your taker is kneeled comfortably, mouth agape, the giver commences to piss, shit, and cum (in no particular order, mind you) into the Cauldron, after which the conCOCKtion is deilberatly stirred using the penis.

To place your testicles into the mouth of a female with a carbonated beverage in her mouth; preferably sprite, because the lack of caffeine makes it feel super good; while the gal in question gargles the beverage, surrounding the testicles

An activity involving discussion between a small group of women about other women or men, usually in a derogatory fashion.

The word has developed as a verb from the actions of the three witches in the Shakespeare play Macbeth.

To suddenly vomit into a significant others vagina while seemingly performing typical cunnilingus. The end result should resemble that of a cauldron, as seen in fairytales with witches.

Practice of when two or more men that share the same toilet play a game of chicken, during which the winner is whoever goes the longest without flushing and the loser is whoever gives in to the awful build up of collected materials.