Why angmohs are called "angmoh".

Angmoh, literally translate from Hokkien, means "red hair" (or because i like the word "mo", i would also say it could mean "red fur", what turf!).

And why are they called so?

Because they are RED.
What turf. Not funny.
Totally stalker-ish curi-curi take pic.

If you look closely.
Yeah, his red alright.
Rofl!