I think it's basically a nonsense joke. is his own made-up word which just sounds like some attack/move of professional wrestling.
* : volvolus or "intestine twister" (I think there's no such attack in reality)
* : (boston crab)
* : hand-rubbing
* : counter-attack, counter-move
So it's something like "intestine-twisting boston-crab hand-rubbing counter-attack", but each word is not really important.
/ in this context is "to take (an attack)".
His head was so confused as if he took this strange "attack", that he almost said those meaningless sentences like /.