The culture in engineering org is to address each other as 'brother' and seniors as 'sir'.

Bhai is the local term for brother.

This is how an average Slack message reads:

"We will make the changes.
CC: @John Doe bhai, @Marcus Fila bhai, @David Elliot sir"

And even though these people are part of the conversation, everyone tags everyone else in each response.

Slack culture is a mess.