Slang, short for "destructive rampage". Specifically, a d-ramp is when a group of people go around their town and fuck a lot of people's shit up. Lawn ornaments, those glass, colorful balls that people put in their yards(gazing balls), mailboxes, and cars are just some of the things that get fucked up. Usually, a d-ramp consists of 4-5 people who are really pissed off or really bored.
"I got a lot of anger built up!"
"You know what that calls for....."