Bulumko Share definition Flag Bulumko is a word used to refer to someone who is okay but mentally unstable somehow. Wow I swear deep down Siya is a bulumko. All he ever does is cry alone. Bulumko by Bubbleprince456 August 15, 2021 0 0 Get merch Get the Bulumko mug. Buy Now — $32.95 See more merch