A throw-up or throwie sits, in the graffiti world, between a tag and a piece in terms of complexity and time investment. It usually consists of a one-color outline and one layer of fill-color. A throw-up is designed for quick execution, to avoid attracting attention to the writer. Throw-ups are often utilized by writers who wish to achieve a large number of tags while competing with rival artists. Most artists have both a tag and a throw-up that are essentially fixed compared to pieces.
"It's one of the most difficult thing to learn, you gotta practice for years, just doing it all time. There's no secret in order to make them…few lines have to be balanced, be prorated and convince you." --Chob