Learn Hardcore Malay: Bos suka berpakaian formal setiap Isnin. - The boss likes to dress formally every Monday.

Bos in Malay is a common loanword from English "boss", and it’s fully accepted in everyday Malay. In this sentence Bos means "the boss" (a person’s superior at work).

You’ll also see more formal Malay words like ketua (chief/head), pengurus (manager), or majikan (employer), but bos is very widely used in speech and informal writing.

How do I say "my boss" in Malay? Does "Bos" by itself already mean "my boss"?

Bos by itself just means "boss" in general.
To say "my boss", you usually add a possessive word like:

bos saya – my boss (neutral, common)
bos aku – my boss (more casual)
bos kami – our boss

So:

Bos suka berpakaian formal setiap Isnin.
= The boss likes to dress formally every Monday. (context decides whose boss)
Bos saya suka berpakaian formal setiap Isnin.
= My boss likes to dress formally every Monday.

In English we say "the boss", but there’s no "the" in Malay. Is that okay?

Yes. Malay normally like , , or .