Getting caught "white-handed" is when someone is caught in the act of masturbating. They could be masturbating to porn, or they could just be having some fun with themselves on the toilet. White-handed refers to the cum that drips out of their penis and onto their hands if they don't clean it up right away.
Ethan's mom: So I was going into Ethan's room yesterday to give him his laundry, and then I caught him white-handed!
Ethan's teacher: I caught him in school once! He is such a horny kid...
A combination of snipe hunting and to be given the runaround. Part of the phrase, " Go find me a left handed smoke shifter" This is to be said to one of the more gullible members of the group. That member is then sent on a fool's errand, running from campsite to campsite as the people at each campsite tell him, " No we don't have one, but I heard so and so has one." In other words; something that doesn't exist that is used to send someone on a fool's errand.
A Left-Handed Charlotte is a strong cum shot to the face while screaming "WILBUR" that forms a "web" over the left eye. (Use of the left hand is preferable, for consistency.)