someone who is obsessed with youtube and believes everything that happens on it and so is said to be a yoob with too much time on their hands.
Chris is a yoob because he believed that a big mac would stay the same after 18 years after seeing it on youtube. he also has too much time on his hands.
When someone performs something they've obviously learned only on youtube thus making it embarrassing to those who have seen the specific clip call these people 'Yoobs'.
From UB - Unbombed, the word to describe Americans (or most people living in first world countries) who make every armed conflict about themselves even if there are thousands miles between them and explosions.
Twitter user from comfort of their home in LA: it's so hard to live through so much war, why can't I enjoy my 20s like a normal person 😭
Someone from an active war zone: shut the fuck up yoob