This is when you're sitting on the toilet after a hellacious night of binge drinking, releasing the kraken of your asshole into the porcelain abyss, and you realize...
Shooting the Gap refers to when one has the beegees and is sitting on the toilet releasing a massive amount of watery feces then suddenly they have to barf so they must "shoot the gap" between their privates and the bowl.
after a long night of burritos and liquor Kevin ran to the shitter and ended up shooting the gap. he barf all over his balls
When your wife is sleeping peacefully so you slide your arm around her and shove smelling salts in her face. You then use her horrified recoil to shove your dick up her ass.
My woman went to sleep on me after making promises earlier in the day. So I hit her with the Nose Slap Ass Gap.