A joke of r/gunmemes and the Kentucky Ballistics community.
When Kentucky Ballistics shot a bad 50. SLAP round, his rifle exploded, almost killing him.
When he realized he had a hole in his neck, he gave it the Kentucky Plug (Sticking the thumb of a male individual into a hole a thumb can fit in)
It then became a sex joke, and gained newfound popularity.
Liam: I told my girlfriend I was gonna give her the Kentucky Plug tonight and she squirted all over me
Nick: Jesus Christ.......