Lac-attack

Because there's no name for when you get a reaction from being lactose-intolerant.

Friend 1: "Aren't you gonna get a lac-attack?"
Friend 2: *continues to eat ice cream* "I shall choose to suffer the consequences of my actions."

Lac attack

When a person who is lactose intolerant eats something dairy and has a bad reaction.

I really want that chocolate ice cream but if I eat it I will for sure get a lac attack.