"Wait on" or "Wait for"?

[Josephus]

I see it in writing, on forums and the like, all the time.

[Slargos]

Is it an americanism or an engrishism?

In Swedish, we say "vänta på" or "waiting on" and it becomes natural to translate it that way.

[Warspite]

"I had to wait on the bus for what seemed like an hour."

I read that like you were stuck in traffic for an hour.

[grumbler]

"I had to wait on the bus for what seemed like an hour."

I read that like you were stuck in traffic for an hour.

Yeah, not a good example.  Maybe "I had to wait on my lawyer's answer for an hour."

[MadImmortalMan]

I see it in writing, on forums and the like, all the time.

Yes, but that's just illiteracy. Not a colloquialism.

[garbon]

I see it in writing, on forums and the like, all the time.

Are you expecting proper grammar on a forum?

[grumbler]

I see it in writing, on forums and the like, all the time.

I rather suspect that you hang out in illiterate circles.  I've never seen "of" used in place of "have" in writing (transliterations of speech aside) and, even if I I had, it isn't as annoying as people not using any capitalization or punctuation or sentences and just writing one long rambling string of words after another until it is hard to even fucking tell what they are talking about if anything okay understand what I mean