Lactdose

To feed someone with lactose intolerance something containing dairy, and not tell them until after they've eaten some/all of it. Can be accidental or intentional.

A: "Here try this dish I made"
B: "Mmmm it's delicious!"
A: "Yep well 2 cups of heavy cream will do that"
B: "YOU LACTDOSED ME"
A: "Oh I'm so sorry! I didn't know you were lactose intolerant"
B: "THAT DOESN'T MATTER NOW" (diarrheas everywhere)