j-squat
A person who's always bragging and won't stop talking about how great they are.
My cousin's friend is a j-squat. He said he's the best at everything and even beats the school principal at video games.
At the dinner table, the j-squat talked about how he was the best at everything and even beat my grandma at cards.
The j-squat in my class said he was the best at everything and even beat the teacher at math.
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