MHS

Mouth hole shut. A hand gesture (similar to telling someone 'to be quiet') given when a co-worker comes skipping over to your desk to ask you to check something that they already know the answer to.

MHS - This would be a good time to turn around and go back to where you came from.
Example...
Co-Worker: Can you check in <insert work system here> that you're unable to see <insert specific detail here>? Huh, I got the same response when I tried.

Me: *signals* Mouth hole shut.
Co-Worker: What?
Me: Go away lol