underdungers
/ˈʌndədʌŋəz/plural noun NZ informal
Underpants: he prefers cotton jocks or boxers to nylon underdungers...
- That is one cool pair of underdungers!
- I bought some new underdungers to take on holidays.
- Wool or nylon underdungers may warm up your testicles too much.
Origin
1980s: from under(pants) + dunga(ree)s, with a possible pun on dung.