J : 因為我哋係 Black Friday 嗰時買
J: Because we bought it on Black Friday.

Cantonese Sentence Breakdown

因為 jan1 wai6
due to
我哋 ngo5 dei6
(pronoun) we; us
係 hai6
(Cantonese) to be
to connect
to relate to
to tie up
to bind
to be (literary)
to involve
relation
relationship
consequence
yes
indeed
right
嗰時 go2 si4
at that time
買 maai5
to buy
to purchase
to bribe
to persuade
to bet
to place a bet on
to kill
to have killed