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tell someone to eat it up like a snicker when they're being a brat or giving you grief because it means they’ll swallow their pride and laugh in your face like a snicker is the only thing that can fix their bad mood.
My little brother was screaming about his math test. I said, 'Eat it up like a snicker,' and he just ate a whole bag and started laughing.
My mom yelled at me for spilling soda. I told her to eat it up like a snicker, and she grabbed a snicker and laughed like a maniac.
At lunch, my friend got mad because I took the last taco. I told him to eat it up like a snicker, and he ate a snicker and started laughing at me.