Unlike throwing a hotdog down a hallway which means u banged a really loose chick, "Like Trying to Drive A Mack Truck Down a Hallway" means that u had penetration problems or she was just really tight
For example my cousin was unable to bang his girlfriend because she was to tite so that situation would be described as Like Trying to Drive A Mack Truck Down a Hallway
It is said of the situation where a person has the bad luck to make contact with his testicles against an undefined surface or object, intentioned or not.
Given the nature of the word, it is more appropriate to design cases where the interaction is made with a moving object, for example, a ball.
Although it is extremely painful for the victim, it tends to be considerably funny to people who witness it.
Today in the baseball game the pitcher took a nutshot; the baseball hit him in the nuts.
Man, I just watched the funniest nutshot video ever.