Stone washed denim clothing that is taken to the next level. "Boulder washed" attire can come into one's wardrobe through an extreme means of natural wear and tear (usually beyond the article's reasonable lifespan), or can be purchased in a store for far too much cash.
"Damn son! Where's Doc and the Delorean nigga!? You really rockin them boulder wash jeans to Dave's party!? Yo dude, them shits is bleached more than Shandra's weave and you got so many holes in em, bitches gonna think I found you back in 1984 for real son!"