grundies

Australia New-Zealand UK plural plural-only slang

(Australia, New Zealand, UK, slang) Underpants.

Japanese Meaning

下着（アンダーパンツ）

He forgot to pack his grundies for the camping trip, so he had to borrow a pair.

彼はキャンプ旅行にパンツを持ってくるのを忘れてしまい、仕方なく1枚借りた。

Sense（1）

(Australia, New Zealand, UK, slang) Underpants.

So I shrugged and shifted like my grundies were too tight.