Most people think it has to do with Boa constrictors but in reality it has nothing to do with them at all.

My user name is from the Bible. In the New Testament Boanerges is a surname applied by Jesus to the two sons of Zebedee, James and John, in Mark 3:17. Possibly because of their fervid and impetuous temper.

Greek translation of Boanerges - Sons of Thunder

I wanted a Biblical user name and I struggle with my temper/anger also so I picked this name. I use it on all the forums I am a member of.