What does this username mean?

Can you explain to a non-D&Dr why it’s so clever? Feel free to beat me with a Clue by Four.

The irony double meaning is funny, the +3 is an instant inside joke to RPG players. I just think it’s clever.

I don’t think it’s that funny and I used to play D&D back in the day. Then again, I don’t know why his original name was Crazy Chop either.