As defined in the "Brocabulary", "Dave" refers to the Dave Matthews Band (DMB). Dave Matthews Band concerts are mainly attended by high school and college students, most of whom are too drunk from tailgating to make it to the actual show. Those who aren't too drunk have the pleasure of enjoying Dave and company's 30 minute jazz odysseys while smoking weed.
(1) "Yo bro, you goin' to Dave this summer?"
"Yeah dude, lawn seats for both nights. Totally getting shitfaced."
(2) "I was so high at Dave last night that I actually liked his music."