I can do that but I don't wanna
A ridiculous excuse someone uses when they think they could do something but they're too proud to admit they don't wanna. It's like saying you're the best but you're still too proud to try.
'I can do that but I don't wanna' when your friend says they can eat an entire pizza in one bite and you're still trying to finish yours.
'I can do that but I don't wanna' after seeing your dog run a mile and you're still too proud to walk.
'I can do that but I don't wanna' when your teacher says you can take the test tomorrow but you're still going to sleep through it.'