raster burn = R = rat belt

rasterbation n.

[portmanteau: raster + masturbation] The gratuitous use of computer generated images and effects in movies and graphic art which would have been better without them. Especially employed as a term of abuse by Photoshop/GIMP users and graphic artists.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.