To bag - to respond to, or speak about in a disrespectful manner. To offend in a way intended to insult. To criticize, to find fault with. To diss, with contempt.
Australian Slang.
1. "Why would you date HIM?"
- "Don't bag me.."
2. "He looks like a pile of butts.."
- "stop bagging him man"
3. "Mate. I said he was aight that one time.."
- "nah man, you bagged him."