When a group of young British men dressed in untucked shirts, boot cut jeans and gelled hair gather at a pub, club or party and proceed to stand in a circle facing each other with their pints of beer rested against their stomachs, looking over their shoulders cynically and/or with shit-eating grins.
The men are the Choads.
Their pints of beer meeting in the middle form the crystal.

The fecal matter that is caked on the back of a man's testicals.