Chat speak is largely used on the internet, in text messages, in notes passed in class, and sometimes in spoken speech. In its most basic essence, chat speak is a thorough mutilation of the English language, created by teenagers who refuse to learn said language.
Beware of chat speak users. If a person is too lazy to learn the difference between "Let's eat, Grandma." and "lets eat grandma" they are probably too lazy to understand that it is wrong to actually eat one's grandmother.
Two examples of chat-speak are:
why cant we just all start singing the world would be so much funnier if people just started singing
Why can't we all just start singing? The world would be so much more entertaining if people just started singing.
& (used above)
lets eat grandma
Let's eat, Grandma.