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From Encyclopedia Dramatica

A phrase originating in the Something Awful forums to describe images often used on USENET before the popularization of forums on the internet. An image macro is a photo or picture with a (usually) witty phrase superimposed over it, most commonly in white 48pt Impact with a black five pixel stroke. Often used in flame wars and a fundamental feature of gif wars, they convey a humorous message of disdain towards the original poster or the entire thread.

If overused, their impact can be diminished, leading to a lack of lulz (see LJ Awards). Most image macros suffer overuse within hours of their debut, quickly turning into old memes. 99% of the internets is oblivious to this and will continue using them well past their expiration dates, or until 2007, when the O RLY owl will swoop down and pwn them in the ass.

All you need for a good macro is a hilarious picture with a hilarious caption. Both are needed for the perfect macro. If you are a lazy motherfucker, you can have a website do the work for you.[1]

[edit] What do they mean?

Sometimes, not always, the meaning of certain image macros is not always clear. They can leave fear, uncertainty and doubt in the minds of the receiving individual. Here is a brief guide to what some image macros mean.

You have just received this macro:	It means:
	I regret to inform you that you were just pwned. Sorry. Note: if you receive an image macro of any kind, it most likely means you have been pwned by said macro if not sooner.
	You are a queer gay homosexual faggot. See article: You're a homo
	You are using old meme image macros. Please stop or face the consequences of these actions.
	You have been Pwned by a Psychic
	Excuse me. I could not help but notice your annoying babbling. Would you mind if you stopped?
	Due to the shocking nature of what just happened, I am completely speechless.
	I am dumbly referencing pop culture to let you know things I could just say myself.
	Dogs are funny
	Thank you for sharing your porn collection, you fucking pedophile. (see: not4chan)
	Married to the sea is A plus.
	I would be impressed if you gayed it up to this level, but you even failed at that.
	I am doing something gay. I am heterosexual. Ergo, I am cool.
	Son of Art/Rosie O'Donnell's fat midget ass on a defamatory macro. Is that teh herpes on the left? Look them little pudgy Republican soccer mom fingers!
	I'm sorry sir/ madam, but you obviously do not comprehend what is going on directly infront of you so it may help to just sit back and watch for a while longer until you do.