the delightful act of cramming the fist and forearm of the dominant partner, or the "puppeteer", into the ass of the "human puppet"/ "flesh Kermit". The puppeteer then opens their hand and operates the submissive individual in a manor much akin to Kermit the Frog. Then, the two begin to sing "it's not easy being green" in unison. The moisture coating the forearm upon removal is the purpose for the "wet" in the act.
"Guess who just pulled off the wet kermit! That's right!"
"sir, you're under arrest. Place your hands on the hood of the vehicle"