咁大隻蛤乸隨街跳 (gam3 daai6 zek3 gap3 naa2 ceoi4 gaai1 tiu3) — There is no free lunch in Cantonese

so; to such a great degree (used to modify the following adjective) | [國] 這麼, 那麼

a Chinese family name

single; alone; one only

clam; gecko; [粵] frog

(of animals) female

a Chinese family name

street; road; thoroughfare

skip over (over); jump; make omissions

how could that possibly be true? are you kidding? how could i believe such a glib? (lit. where would there be such a big frog hopping around the street?)

(literally: where would there be such a big toad hopping around the street?); a rhetorical question suggesting that a deal is too good to be true