An icebreaker. A phrase questioning the presence of active individuals in any given situation and/or conversation. It can be used to verbally examine "who" is AT a specific place, state of mind, or if they ARE there. It is essential for one to understand that "who" is not a single person, but is more or less, referred to as a specific group of people that are often considered to be a whole. It can be used when someone knocks on your front door, or simply when there is an unexplained radio silence between you and your friends via text message or WhatsApp. The primary use in a group text message chat is to stimulate conversation. You can always count on "Who we got?" to bring you the answers in any state of social confusion.
Philip: "Oh, who we got!"
Harrison: That is my friend Benjamin, I was expecting him.
**Group text message**
Steve: "That was a funny joke David!" (posted over two hours ago)
Steve: "Who we got?" (posted a minute ago)
Jake: We have a number of people!" (posted 2 minutes ago)
Alex: "I'm here!" (posted 2 minutes ago)
David: "Me too!" (posted 3 minutes ago)