slang for the word "done". Used when you have completed or quitting a task. It is also used to describe when you are bored. Nihilists often use this word. It is popular when using this word to spell it out.
man: that was so deez when you jumped off that cliff
me: yaaaaa i know, but
man: but what mann me: it was really undeez when you didnt jump off with me
man: haha, undeez sounds like undeez as in underwear, haha