
Listen, this is Grinman, he has the scariest muthafugging grin on the internet. An-D has nothing on this guy. Notice the position of his mandible in relation to the rest of his skull. Now, the internet is the storage place of all human knowledge. If a grin were something open mouthed, then grinman's mouth would be open. Rictus may mean mouth orafice, but grin means closed mouth. Host has obviously set up a contradictory requirement so as to sow panic into the minds of this board to appease his Lovecraftian overlords.
And just in case you think this man is Cockmongler, you're wrong. It was Grinman way before that.
Besides, have you ever seen an open mouthed cheshire grin?