Definition of longshot
An longshot is a game that has very little chance of success. The expression can be used in poker, but also in other disciplines. For example, if you go to horse racing and your horse has odds of 95:1 (95 to 1), you know it's a "long shot" bet. The bad news is that you won't win your bet often, but the good news is that when you win your bet, you will make a lot of money.
An example of longshot to poker
Some players in position will like the longshot's. They probably think they have an unlikely draw and if they hit, they'll make a lot of money and if they don't hit, they'll always have the option to bluff since they're in position. Let's say a player opens 67 in clubs on the button. The player on the small blind has AA and it goes to a standard 3bet. The player in position calls with his hand. The button knows that the small blind is very strong since she doesn't play often. The flop falls T-2-K with only one club. The small blind bets and the button calls for an "longshot". Here we know that the small blind almost always has a big pair. The player on the button usually has a 10% chance of winning the slaughter bet.