I wish it was aliens, that would be easier to deal with. The yard IS very bumpy, house was built about 3 years ago in Georgia. The builders simply roughly leveled the ground, burying EVERYTHING left from construction in the fabulous Georgia red clay, then put Bermuda sod on top. Absolutely NO topsoil under it that wasn't part of the sod, so the bumps are going to be very hard to get rid of. I have the lawn plug-aerated at least once a year which has helped a bit, but the ground under the sod is so hard even soaking would only soften the turf, not the underlying clay. I think the only way to level it would be through repeated topdressing, which it looks like I'll have to get done in the fall.
Thanks again for all the advice!
That’s the ticket. Get it level.