1. her boyfriend's this built jock who's a big deal on the varsity sports circuit at school

What does jock and circuit mean here?

2. maybe it is a lottery, but the universe makes it all even out in the end

What does out mean here?

3. "I can't wear that, Mom," I whined. "You'll hardly notice them," said Mom, trying to be cheerful. "They look like headphones." "Headphones? Look at them, Mom!" I said angrily. "I'll look like Lobot!" "Which one is Lobot?" said Mom calmly. "Lobot?" The ear doctor smiled as he looked at the headphones and made some adjustments. " The Empire Strikes Back? The bald guy with the cool bionic radiotransmitter thing that wraps around the back of his skull?" "I'm drawing a blank," said Mom.

What does I'm drawing a blank mean here?

Question

1. her boyfriend's this built jock who's a big deal on the varsity sports circuit at school

What does jock and circuit mean here?

2. maybe it is a lottery, but the universe makes it all even out in the end

What does out mean here?

3.  "I can't wear that, Mom," I whined. "You'll hardly notice them," said Mom, trying to be cheerful. "They look like headphones." "Headphones? Look at them, Mom!" I said angrily. "I'll look like Lobot!" "Which one is Lobot?" said Mom calmly. "Lobot?" The ear doctor smiled as he looked at the headphones and made some adjustments. " The Empire Strikes Back? The bald guy with the cool bionic radiotransmitter thing that wraps around the back of his skull?" "I'm drawing a blank," said Mom.

What does I'm drawing a blank mean here?

Answer

A "Jock" is a stereotype for a guy who spends a lot of time playing sports. "Built" means very muscular. 
"Even out" means that it will become equal. So if someone won the lottery, "even out" would mean that after some time, it will be like he never won at all. 
When someone "draws a blank", it's an idiom that means they can't think of anything. It's like trying to draw something, but you can't think of anything to draw, so the page stays blank.

Answer

Built jock - fit, muscular athlete, circuit- teams

Even out - balance, equalize

I’m drawing a blank- I do not recall or remember

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