Characters
I know you can be underwhelmed, and you can be overwhelmed, but can you ever just be, like, whelmed?
— Chastity • 10 Things I Hate About You

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker plays with the language of feeling: we readily say underwhelmed and overwhelmed, so why not a plain middle state, whelmed? It is a light, comic thought that mocks how English seems to offer extremes but no word for being moderately, unremarkably affected.
Context reviewed