Mattababy Share definition Flag A pervasive unpleasant odour, often picked up on by quipsters, much to the dismay of those around them. ‘It smells like a mattababy in here’ ‘What’s a mattababy?’ Mattababy by Spoop784 June 20, 2024 0 0 Get merch Get the Mattababy mug. Buy Now — $32.95 See more merch