A person who has failed to develop their own personal tastes and therefore has adopted boring, conformist, tastes. A basic person is only interested in things that are mainstream , popular, and trending and they will dress , act, behave similar to how others do. A basic person has no defining characteristics and is devoid of intelligence and/or the ability to socialize on a very basic level.
Are you a YouTuber? Ew that's so basic!
I tried having a conversation with her for 10 minutes but it was impossible! She's so boring and basic!
Person 1: hey guys do you like my most recent YouTube video?
Person 2: Ew I'm not watching your videos they're basic just like you!