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1.
A burnstache may occur when a non-moustached person has spent an intense, significant amount of time kissing or rubbing faces with a moustached person. The area above the upper lip will become very red and raw, and may develop bloody scratches which could cause scabbing.
"The Princess developed a wicked burnstache after making out with Mario."
by bunnieavenger February 15, 2007
 
2.
A style of facial hair popular during the civil war and still respected to this day. The burnstache consists of sideburns leading directly into the mustache - it similar to the beard but the hair on the chin is shaved. A prime example of the burnstache would be that of Major General Ambrose E. Burnside of the Union Army.
Me: Why General your facial hair looks absolutley top-shelf today.
Major General Ambrose E. Burnside: Why thank you, good man.
Me: Would you call that a burnstache?
General Ambrose E. Burnside: Enough chit-chat, Ive got a rebellion to surppress.
by a real hottenany99 August 16, 2009