gaffewww
A joke that makes you laugh at first, but then it hits you with something so gross it makes you want to run away.
'I told a joke about a pirate. He laughed... then vomited on my shirt.'
'My brother told a joke about a robot. It ended with the robot throwing up confetti and spaghetti.'
'I told a joke about a monster. It ended with the monster eating my lunch and throwing up on my desk.'