A mockery name for the Swedish metal band In Flames. Usually used by the fans of the bands older production, or metalheads who dislike the band in general.
The name was made up somewhere around "Clayman-Reroute to Reamins period" due to notable change in their music
Metalhead#1: Have you heard the newest abomination from In Flames?
Metalhead#2 You mean n' flaymz