Example 1:
Person a: Are you painting?

Person b: Yeah. I have a brush in my hand, paint on the brush.
Person a: God you are so freaking smartastic.

Example 2:

Person a: Is that a speed trap? (the cops stops traffic)
Personb: Oh, yeah because a cop would put a barricade up if they were trying to catch you speeding.
Person a: Why do you have to be so smartastic to me all the time?

Bro since I got dirtpilled on Tuesday I have made sooo many worm friends and made them soo many little houses to get married in. Me? Lonely? No you’re the lonely one u lawn owning freak

Sally: "Nothing is worse than someone waking you up from an awesome dream!"
Jesse: "Really? Not even death, cancer, a car wreck, or a billion other things?"
Sally: "Don't be smartastic, you know what I'm saying."