Climbing on top of public and/or private school roofs with buddies.
Usually different schools have different difficulty levels: level 1 schools having easy access to rooftops and level 69 schools being the hardest to escalate.
An example of a level 1 school would be queen of apostles school. an example of a level 69 school would be stanford.
Tylur: yo dude let's go school hopping tonight, we gonna hella conquer lincoln high school!
Carlitos: yeah dude we can piss from on top of the roof afterwards yo