When you grow facial hair that's not quite a beard, but not quite stubble. Personified by Jersey's Hero Bruce Springsteen and imitated by Singer Songwriter's World Wide.
Can also be used as a verb (Sprinsteening) when someone is in the phase between beard and stubble.
Hipster in Austin Texas - Dude, you're totally Springsteening your way into being a Beard Rocker.
Lonesome Folk Guitar Player - Yeah, I've been trimming my Springsteen down in the hopes of achieving more indie cred.