A person with two degrees from Tufts University. The mascot of Tufts being the famouscircus elephant Jumbo, students are often called ‘Jumbos’ as well.
Mike: Oh I didn’t know you were a double jumbo! What did you study?
Sidney: Yeah, I did my undergrad in chemistry and my PhD in ::gets rudely interrupted::
Innocent bystander: WOW! did you just call her fat?! What’s wrong with you?!
Sidney: Actually a “Jumbo” is what we call a Tufts graduate - and if you have two degrees we call that person a “double jumbo”
A minecraft youtuber who is British and does a lot of red stone he is a pretty famous youtuber and made some really cool things has many parody’s of him.