cutting heads
An impromptu show down with musical instruments. This practice can be observed at Guitar stores when two people try to out do eachother with their bad ass Steve Vai style.
Jeff was cutting heads with that church choir bass player at Guitar Center.
cut your head off
An insult used in New Zealand and Austraila. Apparently telling one to cut one's head off is a bigger shot to the balls than calling one a bugger.
American: Might as well cut your head off
Aussi: What did you just say ta me?
*Ameircan has his arse handed to him.*
Aussi: What did you just say ta me?
*Ameircan has his arse handed to him.*