Walmart P.M. Share definition Flag A tired/droopy/exhausted feeling experienced right when one walks into WalMart. Person A - I can't sleep, i'm going to go to WalMart. Person B - Ahh WalMart P.M. Gotcha. Walmart P.M. by brandt77 February 11, 2008 0 0 Get merch Get the Walmart P.M. mug. Buy Now — $32.95 See more merch