the sun is already high in the sky, sarcastically hinting it is not early any more
Definitions (粵典–words.hk)
形容詞
太陽都出咗好耐,接近中午 high noon
細佬瞓到日上三竿都唔起身。
细佬瞓到日上三竿都唔起身。
sai3 lou2 fan3 dou3 jat6 soeng5 saam1 gon1 dou1 m4 hei2 san1. My younger brother sleeps till high noon and still does not want to get up.