This is a term that is used to describe when someone or something is so offensive or foul that they make your teeth itch. Would be similar to someone making your skin crawl. Only worse. If you don’t think this is a real saying then you’re making my teeth itch.
Hey Dave, did you see that announcement Boris Johnson made about the party at Downing Street?
“That cunt does nothing but make my teeth itch every time he opens his mouth…”
A guy who shits in his girlfriends bed for revenge and makes the bed up so she'll slide into it when she crawls under the covers.
Bob made Shirley's bed after he shit on her side. He flattened the big steamer and wiped his on her pillow case because he wanted it to be a surprise. He took a make the bed shit.