唔m4知zi1幾gei2

English

1. don't know why it is so…
2. very; beyond imagination; to imply that the hearer or the others does not realize how high the level is

粵語 — Cantonese

1. 非常、好，到一個超出對方設想嘅地步，暗示對方或其他人唔了解程度之高

Examples

• 佢咩唔中意iPad呀，佢今年生日收到都唔知幾開心。

  He doesn't like iPads, you say? You have no idea how happy he was when he got it on his birthday this year.