Nailed it nods
You're so confident you nod at yourself like you're the only person who knows the secret to life and you're not even bragging about it.
I figured out the trick to the game before anyone else. Nod. Nod. I'm a genius.
He knew the answer before the teacher even asked. Nod. Nod. He's a legend.
She got the best grade in the class. Nod. Nod. She's the best.