cut heads
v.— «I still long to be in a band that plays just good, old, classic rock and roll music. After playing that song, Phil asked me if I wanted to “cut heads” which is blues slang for friendly competition of dueling guitar solos.» —“Bands I’ve been in Part 5: The First and Second Gig” by Al Diary of Guitar Guy Al Jan. 19, 2005. (source: Double-Tongued Dictionary)