Terms I start using when I'm (hypo)manic, but denying it.

"I'm a little bit very good." Actually said this to my psychiatrist when she pointedly asked me if I was good or VERY good. I was well and truly manic at this point.
"A little bit energetic."
Excitable.
"I've got my mojo back."
"I'm just enjoying life."
Over happy.

Mostly I would say 'high', rather than mania.