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when somebody in a military grows a big bushy beard while serving as infantry personnel. it is a symbol of status in the infantry. if you have a combat beard, it shows you have been on duty for a while, and have probably seen some action. it is often accompanied by a backwards baseball cap and sunglasses.
girlfriend seeing his boyfriend after service: What is that on your face?!

bad ass guy: Its my combat beard.
by taterfrickintot May 20, 2010
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