ปากหอยปากปู

Etymology
From 🇰🇲; literally "shell mouth, crab mouth"; originally referring words or speeches of a person of low status, to which people usually give no care or attention.

Adjective

 * 1)  cared, attended to, or listened to by no one; receiving no attention.
 * 2)  given to gossip, especially in trivial matters: gossipy, blabby, whispering, etc.