walking period Share definition Flag A girl who seems to be constantly angry at basically everyone as if she were on her period. Dude1-Damn dude! She's such a walking period, she's always fuckin yelling at everyone! Dude2-I know! walking period by that short dude with muscles July 5, 2010 0 0 Get merch Get the walking period mug. Buy Now — $32.95 See more merch