The medium in which something is rendered at a whisper; the physical carrier of something uttered under one's breath.
I barely heard what Jeff said to Tony on his underbreath.
by notalawyerbutplayoneontv January 14, 2010
Get a underbreath mug for your barber Callisto.
A DUDE THAT Is a reject and dosent give a damn about
it he dosent put up with false friends and if u mess

hell kick ur scrawny ass
examle chris coleman is an "UNDERBREATH PUNK"
by slitskater November 16, 2009
Get the UNDERBREATH PUNK neck gaiter and mug.