Reader-added tags (Nico doesn't differentiate, but some things are just obviously reader-added) include "Absolutely No Laughing Naval Base" (reference to Downtown Arahende), "About Time, Saw It Coming" (literally "I had thought of that", but the tag is used similarly to how we use that pool here) and "Handwritten Teleprompter".
Updated
This is a person whose eyes pop out when they're too surprised.They show up in gag manga, as a visual representation of when one's being so seriously shocked to the point it feels like their eyes are popping out, as the saying goes.*Couldn't help seeing it that way now.
PFFT—
No... this is just my rigging. Its eyes aren't popping out, okay.