When a normally clean shaven fellow lets his facial hair grow the entire week he is on vacation in an attempt to see:
A) How long it will grow
B) How long he will last before it itches so much he has to shave it off
A) Ben was very proud of his vacation beard that he kept until monday morning before his first day back at work.
B) Ben's vacation beard only lasted until Thursday, when the itching became too much and he had to shave it off.
The week-long growth that men get when on vacation or sick that they don't bother to shave due to laziness or illness, until they finally decide that they need to get back to their life.
On his roadtrip, James grew a shaggy vacation beard, but his girlfriend made him shave it as soon as he got home.