A thing that Markiplier says every once in a while, but is most memorable in his 2017 video, "I LITERALLY THROW MY CHAIR IN RAGE | Getting Over It - Part 1" In which he attempts to try and figure out what type of hammer is shown on the title screen. He also said "Wumpus Woo" in a FNAF 4 Let's Play that I am too lazy to go look for.
"Oh! A hammer! A chisel. Ahhh... pike! A thmackadoodle. A wumbly woo, an ice pick. Eeeuughg- a rock pick- A PICK!"