v. To sleep in your clothes and wear them again the next day.
Boss: Johnson, you've been wearing that flannel shirt and those corduroy jeans for two days straight! What gives?
Johnson: I've just been too lazy to do laundry anymore. I decided to grunge it.
To relegate an extremely brilliant song to the status of a B-side or soundtrack contribution. The origin comes from Pearl Jam leaving the absolutely awesome track "Yellow Ledbetter" off of their 1991 debut album 'Ten', instead making it the B-side to "Jeremy", although "Yellow Ledbetter" has since become one of their most well-known songs.
Person A: Man, I just heard "Girl Afraid" by The Smiths for the first time! I can't believe it was a B-side!
Person B: Yeah, man, they totally ledbettered it.