a straight draw that only one card rank will fill; also called an inside straight draw. If you hold T-9 and the flop is Q-8-2, you have a gutshot straight draw because only a jack will make your straight. The old adage is never to draw at an inside straight, but sometimes the pot odds make such a play correct.
A straight draw in which there is a specific card required to make the straight. For example, 9-8-6-5 and A-K-Q-J and both gutshots. There is one card needed for a straight, namely a seven in the first case and a ten in the second case.
A straight draw with only 4 outs (as opposed to an open straight draw which has 8). An example would be when you hold J T and the flop is 9 K 2. You need one of the four unseen Queens to make your straight
You are probably familiar with another old adage: "Never draw to an inside straight." And inside straight is a gutshot. For instance, if you have 4-5-7-8 you need a six to make a straight. In other words, you need to hit your cards right in the guts (in the middle). If you do, you will hit your gutshot, and chances are that you will put a bad beat on a rock.
A straight draw in which there is only one rank of card which is able to complete it. An example is if you have 5-6-8-9, you have a gutshot as only a 7 will complete the straight. This is also known as an inside straight or belly buster.