Getting really wasted while on the beach during family vacation; usually leads to the embarrassment of children and spouse over your bad behavior. Dtunk is when you've gone way beyond drunk.
Was on vacation in Hawaii but couldn't get away from this obnoxious dad and his poor family. He was so Dtunk that instead of going to the ocean to pee, he started just wetting his pants right there on the beach. He even asked his wife for one of the babies diapers so he didn't ever have to get up. Man, I felt bad for his kids.