Jamistain Share definition Flag A rude name to call someone with the name Jamison. They will get mad and tell you to go to sleep if you call them Jamistain. Israel: What's up, Jamistain?Jamison: Bro go to sleep Jamistain by BigMamaBS June 2, 2023 0 0 Get merch Get the Jamistain mug. Buy Now — $32.95 See more merch