(I) can too
A phrase used to insist or protest that one can indeed do something. A: "There's no way you can make that jump." B: "I can too! Just watch me." Can too! I'll do it right now, in fact!
(I) can too.
You are wrong, I can.; Don't say I can't, because I can! (The response to (You) cannot!) Sue: I'm going to the party. Mother: You can't. Sue: I can too. Mother: Cannot! Sue: Can foo.' "Can too!" protested Fred. "I can, if you can!"