Basic
Often used to describe someone daft and simple. Can also be used to allude to sexual incompetence. As well, somebody who is not discerning when it comes to choosing sexual partners.
'You didn't understand any of that? You're basic!'
'What do you mean he didn't make you cum? He's basic!'
'Don't date THAT dude, he's basic!'
'What do you mean he didn't make you cum? He's basic!'
'Don't date THAT dude, he's basic!'
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