This word originated in the cape flats, south africa and is used by the coloured youth and gangsters. It carries a variety of meanings which include: to mess up, to hurt, to inflict serious damage/pain. The noun of the word generally means ugly or not in a working condition/state.
"Jou goose is mos verdala" - Your girlfriend is ugly
"Ek gaan jou verdale" - I'm going to fuck you up beyond your blood group.
"Your car is verdala" - Your car looks terrible and may not work mechanically.
"Die kinners is mos verdala" - The girls are very fucking ugly.
Adj. Chay is a hybrid word. It originates from "yeah" which evolved into "cheah!" With the addition of "yay!" we form the most excited word of the new millenium, which should be spelt in caps with an exclamation mark for full effect.