It is widely used in the PPOP group SB19's fandom, A'TIN, to call each other. It comes from the word "Kapatid" which in Tagalog means "sibling".
"Kaps, let's use tags to increase our metrics"
"I heard there's a disaster struck in our nearby provinces, keep safe mga Kaps"
"Kaps, I will be giving away some of my ticket as well as prepaid load for streaming"