What does it mean"a sugar rush and a major post-sugar crash" in these sentences
The day of the test,I had chocolate ice cream for breakfast.If I'd had oatmeal,I might've scored six or eight points higher.Sinsemilla's not a boffo mom when it comes to keeping the fridge stocked.So I took the test through a sugar rush and a major post-sugar crash. Not that I' m making excuses.

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High, in this case, refers to the euphoric state induced by saccharine peak occurs in human body after large amount of sugar ingestion. After you"high", or all the sugar in the blood is consumed, you "crash". Crash refers to the despondent mood after substances intoxication.

...In short, high means the exciting state after one eats sugar. Crash is the opposite of High, occurs after "high".