flemperson Share definition Flag Someone who likes spit (usually phlegm) spat into their mouth. Person 1: Oh yeah! Put that flem in my mouth! I'll be your little dirty flemperson! Person 2: ACK! PTOO! flemperson by shane_y April 24, 2020 0 0 Get merch Get the flemperson mug. Buy Now — $32.95 See more merch