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Itchy mouth has a similar meaning like big mouth. It means someone can't stop gossiping or likes to kick up a fuss. It's very common among high school students and 1st year university students.
"Hey pork pie, you need to see a doctor for your itchy mouth!"

"I'm sorry teacher, I can't control myself, but you know the root cause is the school culture?
by 1st year gossip Uni. student March 21, 2009

Words related to Itchy mouth

fresh man gossip pork pie student