1.)When you are bored and just start drinking beers.
2.)When someone has already given you a beer.
3.)When the foam from a beer gets on your chin, thus having a beer beard, known as a beerd.
-I don't know but since Charlie isn't answering his phone he's probably got beerd.
-Jose:"Hey I'm going back in the house you need a beer?"
Marty:"Naw man I've already been beerd."
-I wonder why those chicks keep giggling and looking down here? Ah I gotta take a piss...<Looks in mirror sees a beerd on his chin> Shit!...
A beard containing foam from the top of a fresh glass of beer.
Is that Magic Hat in your beerd?