When you start acting like a mong/retard when you get hyper. Typically seen in people with ADHD or Autism. Sometimes caused by sugar but can also be caused by girls talking tothe person.
somethingredundant that yousef usually says or asks. he usually says it after someone said the same exact thing 2 seconds before him.
random student-"what's a variable?"
teacher-"a variable is a symbol that represents a quantity that may assume any given value or set of values."
2 minutes later:
yousef-"what's a variable?"
teacher-"Heh there you go with your yousefisms."
class-"Hahahahahahahaahahahahahahaahaa"
Using stolen gasoline to burn local parks, specifically playgrounds.
Yousifing is a term used to describe when gasoline is specifically stolen, to commit arson.
Person 1: Hey bro, want to go yousifing?
Person 2: Sure dude! We'll steal my friend's gasoline and head over to the playground.