The zipper-mouth face emoji means silence or secrecy. It suggests that someone is not going to speak, cannot speak, or is choosing to keep information private.
🤐
Common uses
People use it for secrets, gossip they cannot share, "no comment" replies, awkward topics, or moments where saying less is smarter.
Playful or serious
It can be playful when someone is teasing a secret. It can be serious when a topic is confidential or sensitive.
For suspicion or curiosity, the eyes emoji may be a better choice.