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2.
An extremely sexual and mysterious young man with prematurely grey hairs. Usually extremely skinny and attractive.
Look at that greybeard dancing, he's amazing!
by flowerfist January 13, 2011
 
1.
An older man, usually someone with seniority in a business, a labor union or other community. Often used disrespectfully by younger members when referring to preferential treatment or out-dated behavior.
I hate the grey beards. They do nothing but talk about the old days and get first dibs on all the good assignments.
by PrimalChaos August 14, 2010
 
3.
when a girls boyfriend is a mortician and he is fucking the bodies on a regular bases, he will acquire a mite on his penis. when his girlfriend gives him a blow job, she will get the mite on her face. when the mite bites her she will get a Grey rash across the bottom of her face. thus...Grey Beard.
this girls boyfriend worked at the city morgue. since his girlfriend wouldnt put out enough he decided to start fucking the corpses in the body room of the morgue. after awhile a flesh mite got on his penis and bit his girlfriend one day during a blow job and she got a grey rash on her face. thus...Grey Beard.
by pan-cock-ay March 05, 2007