a punishment handed out by a school which the victim would gladly trade for a day or two's suspension, but would rather it than an expulsion.
in other words, it's worse than a suspension, but better than an expulsion.
Joe: damn! I just a suspulsion!
Joe: yeah the school is making me scrape all the gum from the school over the weekend! I'd rather they just suspend me!
Mark: at least you're not expelled!
Joe: yeah you're right.