A
popular trick among high schoolers that allows one to
slap the backside of someone's neck if he/she makes eye contact with the dreaded neckboi hand symbol.
Dude #1: Yo i think you dropped your
pencil*holds out
hand in the neckboi configuration*
Dude#2: Oh thanks mah!
*looks down at dude #1's hand*
Dude #1: NECKBOI!!!!!
*
slaps Dude #2's neck with monstrous force*