Opposite of open-ended (four cards in a row that will make a straight with either low or high card).
A gut-shot straight draw is less likely to suceed because there are only four cards that can help you. Open-ended straight draws have better odds because there are eight cards that can make your straight.
Open-ended = _,3,4,5,6,_ or _,10,J,Q,K,_
Straight draw in which only one card will complete your hand, a.k.a. an inside straight draw. For example, you complete a gutshot straight when an eight is dealt to complete a 7-8-9-10-J straight.
Bruce Lee: If you ever call Ray Lewis a bastard again he will mutilate you and then proceed to eat your children.