If we just search for Rabbit Punch we come up with a way to kill the Rabbit ,lol.
If we search for Rabbit punch in boxing we will find the term as applied to boxing.
The Rabbit punch as being discussed for use in killing a rabbit was a punch dleivered to the back of the rabbits head when trapped or caught on the ground,the punch came up the spine from behind and was a downward forward punch,causing the skull to detatch from the spine,many times this stunned the rabbit rather than killed it,so it had to be repeated often for the desired result.
Holding up of the rabbit by the hind legs provided help by gravity and caused death to the rabbit most often rather than a stun,the strike could be a punch,an edge of hand blow, or by use of a stick or small club.
I hope this helps in our encounters with the ever present threat of the BUNNY.
Remember if it is too big to hold upside down,get it on its belly,mount it and strike forward and down to the back of the skull until unconscious or dead,then before you skin it post a picture,lol.
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If we speak of the rabbit punch as used in boxing it is a punch delivered while in the clinch to the back of the opponent,it can beto the head (face if the oppoent turns their head out) or to the back,especially the kidneys.