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.
Example:

<Person1> How are you?
<Shinosuke> i == gud
<Person1> wtf. Just type 'good'. Isn't that easier?
<Shinosuke> u == sux; i == 1337
<Person1> Whatever.
by Shinosuke October 13, 2004
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"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
Mike: ==
by Sir Yelof October 28, 2010
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