Learn English – When someone says, “I do not feel that good”, what does that mean

From the Urban Dictionary:

1. “Camp” n. or “Campy” adj. refers to intentionally exaggerated thematic or genre elements, especially in television and motion picture mediums. “Camp” style willfully over-emphasizes certain elements of the genre or theme, creating an almost self-satirical milieu. Some of the most popular examples include the James Bond films (exaggeration of espionage activities) and the original Batman series starring Adam West.
2. Being so extreme that it has an amusing and perversely sophisticated appeal.
3. adj. overacted or exaggerated (sometimes purposely),

My initial reaction was that the first interpretation was correct, but that was without context. If you read the rest of the song lyrics, I would contend that the second interpretation is more likely. Consider:

No pain inside, you're like perfection

How do I feel this good sober?

The pain-free aspect could imply a drunken state, but might also mean that pain is what drives her to drink, so this pain-free state is unusual when sober. I think it is more likely drunkness, because she continues, perhaps more pointedly:

Comin' down...spinnin' round...Lookin' for myself sober

When it's good it's so good, it's good 'til it goes bad

'Til you're trying to find the you that you once had

This sounds much more like someone who is struggling with alcoholism, in which case the second interpretation makes more sense, but an intentional ambiguity would be most powerful.