Pete: He's been acting weird lately.
Chloe: Well, okay, Clark's always acting weird. Why don't you give me a gauge? (an example?)
Pete: He was so tired in math class today, he face-planted (his head fell on the desk?) on his desk.
Chloe: I have two words for him. Power bar.(he needs recharging?)
None of the underlined is in my active vocabulary, but I think your interpretation of all is correct.
A "power bar" is a snack (in the form of a bar) that supposedly gives you energy. I'd guess it's referring to that.
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