Yeah, I actually decapped Uke with my butt, and since I figured head+butt= headbutt I called the thread that.

Nice one. I've tried a few backflips into head sits, but they're not decaping.

Butt didn't do the job, so I finished the job with my spine, and followed up with the back of my head.

i made one, i take off his arm, but i lose...

We actually meant butting heads, not butting with heads.

that's mine, I hit with the butt, watch the full replay.