lackwit
A human who thinks they're clever but can't even spell 'clever'. A walking mistake.
She texted me 'I love u' and I said 'you're a lackwit' because it's 'I love you' and you're not even right.
He tried to write a poem and it was just one sentence: 'I am cool.'
She tried to explain the plot of a movie and said 'it's about a man who walks into a bar and nobody laughs.' I said 'you're a lackwit.'