numbshit
someone that's definitely numb to know or understand. it also refers to as someone who can't change from the past with a broken humor or cant change on whatever they've become as the person is "to numb" to change
"This kid keeps laughing about this joke we made last year" said Bob
"That numbshit fucker is still stuck in that humor i cant believe it, what a loser" said Ron
"That numbshit fucker is still stuck in that humor i cant believe it, what a loser" said Ron