Period Slap Share definition Flag When one person (male or female) slaps a woman with a (non-used) tampon or maxi pad, as an insult. Mary was angry at Christina so she slapped her in the face with a pad... boy was that one hell of a period slap! Period Slap by Seamus MacFarland O'Toole June 5, 2010 0 0 Get merch Get the Period Slap mug. Buy Now — $32.95 See more merch