Blow being the opposite to suck, has an entirely different meaning. Or does it?
For years I’ve heard people saying this band sucks or that car sucks, so recently when I heard someone saying a band blew, I assumed they meant the band was really good.
Apparently, this isn’t the case at all because for something to blow means the same as for it suck.
So, either I’m ignorant and behind the times or people are just plain stupid. I’ll go with the former.