Does something like this warrant the "what" tag?

Not even remotely.

The rule is, if you have to consider whether or not its a "what", then its not a what.

Did she cum out of her butt, or is that ice cream?

For manga characters there no impossible things, so it can be arsecum.

That's a big@$$ dildo she's wielding!! XD

Where the hell do I get a bike, and a sword like that?!

I wouldn't want to ride that for long journeys.
Talk about too much of a good thing...