Ok the people here obviously don't know what a macro is. A macro is a funny picture with a caption in it. Usually used on forums. Macros can be made completely from scratch. Or could be just a still shot of something and someone just adds the caption in. Macro can be made from anything. Real life, Anime, Video games. Macros are just funny pictures with a caption (usually using internet speak such as "lol wut?") That are usually used on internet forums.
It's retarded that no one on urban dictionary knows what a macro is.