Used to describe either a redheaded woman or her (unshaven) pussy.
"I'd never known the sweet taste of the firemuff until a Scottich lass took a liking to me over pints of Guinness one night."
by Dick B December 16, 2005
A true red headed woman who has bright red pubic hair.
"I banged this chick last night who had a fire muff"
by Craigco November 09, 2007