The self humiliation tag has only 22 posts and of those, several are mistagged or tagged subjectively; in some cases, humiliation doesn't even seem to be depicted at all.

post #4490442 - self-humiliation is only established in the description
post #4461483 - Unclear? This appears to just be personal self-deprecation, does that count?
post #4173355 - this is just a character getting fingered with no situational context
post #3512218 - this is just public masturbation, with no indication the subject feels embarrassment (and dialogue actually indicates the contrary)

There's currently no wiki page to provide further clarification. Either the tag should be aliased to humiliation fetish (which also doesn't have a wiki page), or it needs a wiki page to provide a clear definition.