berko
/ˈbəːkəʊ/adjective Australian /NZ informal
Out of control with anger or excitement; berserk: some motorists go berko when stuck behind a pootling cyclist...
- You are asked to give plot synopses for the big six classical ballets, and I went a bit berko here and managed to write 32 pages.
- I had to move to a less demanding role because my lower back had a bad habit of going berko about 10 days into a two-week exercise.
- Go berko with the machete for seven minutes, or until exhausted.
Origin
1960s: an alteration of berserk + -o.