What does it mean if a user got suspended?

They've been naughty.

usually they give them a "time-out"

I think that if they are banned, it says that they are no longer a member. I reported one guy and he had a banner warning on his profile for a while.

Somebody reported them.

They went bye bye

they are grounded

It means that you have rubbed too many people here the wrong way. I hope it wasn't you. Anyway, welcome back. Glad to see you still are here. ☺