Bool

1.) To do something very well.

“Woah dude, he’s really boolin’ on that english paper”

2.) To move at a high rate of speed
For example if you saw someone running down the street you might turn to your friend and say “ooh he boolin’”.
Forest Gump is the gif attached is in fact booling.

“Woah dude, he’s really boolin’ on that english paper.”
Or
“Holy shit, that crackhead is boolin’ right at us!”

Shum

Masturbating while taking a shit.

Comes from the words shit and cum mixed together.

“Hey bro where are you going?”
“I'm going to the bathroom to take a shum.”