dackass
A person who thinks they're cool, but they're just loud and clumsy.
He called me a dackass for not knowing the dance move, but he tripped over his own feet.
She said I was a dackass for not knowing the slang, but she said 'bruh' like it was a secret language.
He called me a dackass for not knowing the joke, but he told it wrong and then fell out of his chair.