past tense for bang, with/related to ass sex.
Related to bunger: "A guy who is not too bright and doesn't know which hole is for what."
He bung her last night, but was trying to bang her. He got it in the wrong hole because he had been drinking too much and didn't know what he was doing.
She woke the next morning with a bungover,and said, "Crap goes in, crap goes out."
He was a real bunger, so he didn't know what the heck she was talking about.