401 g Share definition Flag A 401g is the stockpile of weed a person accumulates when they keep a little bit of weed from each amount they've previously purchased, for emergency purposes. Dang, I'm out of weed but I only just started investing in my 401 g 401 g by yikesss March 20, 2016 0 0 Get merch Get the 401 g mug. Buy Now — $32.95 See more merch