dusting
Patting a friend (or victim who desperately wants you to like him/her) on the back with a concealed board rubber. The resulting chalk stripe is nigh on irremovable. The dust cloud evokes memories of Saving Private Ryan.
written by Co*rad *iles, approved by Log

Making sure the board rubber was fully loaded, run up to someone, and start battering the baord rubber with your hand, or batter still, a second, fully loaded, board rubber, producing a cloud of chalk dust which would envelop the unfortunate victim. Skill (the kind in the English non medical dictionary) was required not to suffer blowback.
If blowback does occur, however, take advantage of the situation and have a cartoon fight, in which spectators will only see the occasional arm or leg coming out of the dust cloud as you shout "Ooyah!" and "Take that!"
written by an*nym*us u*er, approved by Log