Equals to, is, anything within that range.
Usually seen in computing languages, but people has been starting to use it more frequently now-a-days.
<Person1> How are you?
> i == gud
. Just type 'good'. Isn't that easier?
> u == sux
; i == 1337
Similar to the =_= face, =-= generally represents a squint-like glare accompianied by the pursing of the mouth; annoyance, indignance.
P1: Hey Bob, what's up?
P2: My room mate is listening to the Hamster Dance for the fifth time in a row. =-= It's all I can do to refrain from smashing his radio.
"Yeah, what he said." Used in forums or chat channels to agree with the post or comment above. Similarly, to say that what someone suggested is equivalent to your suggestion.
Dan: I should write a book but who has the time?
Mike: You could do it if you wanted
Jeff: Just start writing chapters on your blog, then publish them in a book when you have enough