Hetfielding 

To impersonate or become Metallica Front man James Hetfield by Shout "Yeah!" at any given situation; appropriate or not.

There is alot of Hetfielding going on in this Room.

Hetfielding by HMSR March 21, 2013

Hetfielding 

The act of singing with a guitar where the vocal line is completely independent from the guitar line.

"He's been practicing Hetfielding ever since he bought that guitar"
"We need our band frontman to be an expert at Hetfielding, because we can't afford getting two separate musicians"

Hetfielding by redemptoris December 22, 2016