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...
"Oh, man I'm gonna puke"
But there's no trash can in sight, so you have to "shoot the gap." For the gentleman, pull your cock and balls somewhere out of sight and aim..
This is the epitome of epic bodily fluid excavation.
Oh, I missed...I missed...Stan, I'm so sorry. I couldn't shoot the gap.