A baby nerd. Can also be used as an endearment.
Physics teacher: "Come, my little nerdlets, let's build a catapult!"
A little nerd
ON:Tu no es mi hermano
CF: Correct spanish would be "Eres no mi hermano"
ON: Shh, I'm taking french. "Tu n'es pas mon frere, d'accord?"
CF: Nerdlet ;p