Like 'pretty ugly'. The most used meaning of 'pretty' is contradictory to 'ugly', and it could feasibly be used to mean something like (if it were an oxymoron), 'someone who may be considered ugly, but is actually kinda pretty'. But of course it actually means, considerably ugly. Is there a term to describe such pairings?
Edit: I'll add more examples as I think of them:
Don't trust casinos, they're fairly rigged.
I'm an f'ing celibate.
The doctor gave me a sick healthy report.
I'm a bad good kid. -- Like they are morally good, but are bad (not morally bad) at actually making much out of it, as some role-models may do. Like they are comparing themselves to others. As opposed to a kid who is generally a good kid, but does still get into trouble some, so they may be teetering on the edge of not being considered a good kid. Which would actually be an oxymoron.