The act of jamming a .50 BMG up a participating partners asshole with your thumb as deep as you can. Then, lean in and peer into their asshole. Now pucker up and have your partner push that kentucky plug out with all their might, allowing them to vibe check your orbital bone.
The Kentucky Plug is a scatological developed by Kentucky Ballistics. It is defined as a sex position where the user firmly inserts a 50 BMG slap round into the receiver's asshole.