They have a thing like a blade on the side of their legs. Don’t mess with one if he hasn’t been clipped.
I know a lot of farm people, many relatives, who caught roosters and decrapitated them. I don’t remember them ever saying anything like that. Are you trying to spackle my backside with birdlime, Mr. Ditter?
My wife’s aunt would catch them, stand on the chicken’s head and pull it off.
And I had a great grandfather (sword side) who raised three and a few four-legged chickens for a while, until he gave it up.
Maybe you’re talking about the spur that our friends to the south put on the legs of fighting cocks?
It’s called a spur; “I cut you so bad, you ask my why I cut you so bad”.