Help with Cantonese correct translation
"睇下我嘅"  (Taei har ngo gea)

"take a look at mine"

It is definitely colloquial Cantonese.

These kinds of "rough" phrases are usually meant to indicate something to boast or show off or a demeaning comparison, like, "pay attention, you might learn something"; "this is how I would do it"; "you see those biceps?" 

This phrase therefore has to be a follow-on to demean someone else's poor performance.