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You got to get the cat back to the vet. It could be a seroma which is blood building up in the SQ tissue from a bleeder which is also very common. It also could be evisceration which means the fascia layer was not sutured up completely and that is mesentery protruding into the space between the abdominal wall and the skin which is bad. It looks like that considering the size of it and the lack of draining from the skin incision. It will require repairing again. The vet has got to see it to be sure. Right now would be appropriate.......

Ack... thanks.

I was since able to talk to the on-call vet on the phone (who is not the vet that did the surgery) and I described it as "a 'golf-ball sized' swelling under the surgery site that came up rather quickly." and she thought it was probably a reaction to the dissolving sutures inside? She also thought it could wait till morning. Does she just not want to deal with it tonight?