The Irish Shot is a 1979 invention that quickly took off in Irish pubs and other bars around the U.S. It was first created by Charles Burke Cronin Oat, the former owner of Wilson’s Saloon in Norwich, Connecticut.

The Irish Shot is a popular drink for St. Patrick’s Day celebrations, but there’s no reason you can’t enjoy this fun beer-and-a-shot combination all year long. The Irish Shot is a type of Boilermaker, a style of drink in which a shot of liquor—usually whiskey—is dropped into a beer. But in this case, the shot is a two-part mixture of whiskey and Irish cream.

While the above method is the traditional way to serve an Irish Shot, some people skip the shot glass entirely and simply mix all three ingredients in the glass. The visual effects are less impressive, and you lose the excitement factor of dropping a shot into the beer, But it’s less messy and tastes the same.

The Irish Shot originally bore the name Irish Car Bomb. Over the years, the controversial and offensive name has been stripped from marketing campaigns and, while still part of the cultural lexicon, has begun to fade. These days, it’s never advised to order the drink by its original name, particularly if you’re in Ireland.

Reference: https://www.liquor.com/recipes/the-irish-car-bomb/