Buttweary
When you have been sitting for much too long and your backside gets very sore and you can't think straight. But you still don't get up because you are too lazy.
Person 1: Gosh, I'm really buttweary.
Person 2: Why don't you get up?
Person 1: I'm too lazy to get up!
Person 2: Why don't you get up?
Person 1: I'm too lazy to get up!