low-key thicc Share definition Flag a person that appears to be of average frame until they remove their garments and expose their hugeness and strength. Jack looks like a tiny bitch boy, until its tarps off. He is low-key thicc boiii! low-key thicc by MarioSpinsters69 April 15, 2023 0 0 Get merch Get the low-key thicc mug. Buy Now — $32.95 See more merch