Green’s Dictionary of Slang

1. (US campus) a consistent blunderer.

1967–8

Baker et al. CUSS 77: Barse A person who always does the wrong thing.

2. the perineum, i.e. the portion of flesh between the underside of the testes and the anus.

1997

Roger’s Profanisaurus in Viz 87 Dec. n.p.: barse n. The perineum; that little bit between your balls and your arse.