龜背
simp龟背gwai1 bui3guī bèi
English
- a padded vest
- sports training bib; literally: tortoise back
粵語 — Cantonese
- 運動背心（量詞：件）
Examples
O camp 完咗大家都會寫龜背。
When O camp goes to an end, everyone graffitis on each other's bib.
Sources: cc-canto, rime-cantonese, words.hk