Nerd

To many people its one thing, for my family its a friendly insult which actually means we love them.
Or means you love someone but they're acting like a smartass at the moment.

Me: *Tells smartass joke*
My family: Pfft, shut up Nerd, Hahaha.
Me: Hahaha.
or
Me: ',:)
My GF: Nerd, Ily.
Me: :)