His Ass 

At the end of smoking marijuana through a glass pipe, one might suck through the ash of the smoked marijuana where a whole forms showing the bottom of the bowl. This hole is known as "his ass"

I was ripping my bowl yesterday and it shit on me so i filled his ass up with green and continued smoking.

His Ass by Lord Peach December 6, 2010

His Ass Is NOT Duc 

Referring to an individual who is NOT janitor “Duc” at Keller Central High School.

*janitor who is NOT Duc walks into a room* “Oh my days! His ass is NOT Duc!!” patrick winslow sylvester said.

His Ass Is NOT Duc by KaiGKempferEsq. December 6, 2022

fingers in his ass

Fingers in his ass is a meme mainly quoted/said by Danganronpa fans on a site called tumblr or Danganronpa fans in general.
The sentence is usually associated with the pairing sansmaeda. There is also a thing called fingers in his all sunday. On Sundays people gather to appreciate the song fingers in ass and sansmaeda. On December 16th 2018, the day before tumblr's adult content ban fans of sansmaeda and fingers in his ass sunday celebrated what was called the "final" fingers in his ass sunday.

Origins:
On july 17th, 2017 user named skeletortilla uploaded a video on tumblr that had Nagito Komaeda from Danganronpa 2 and Sans from Undertale dancing together to a song called "ASSHOLE (Fingerfückung)" made by BotanicSage on youtube.

Kanye west he likes fingers in his ass
It's fingers in his ass sunday!

fingers in his ass by Pupseus December 17, 2018

Go Jehovah on his ass

When you join a religion because your child hates you on every holiday because it doesn't meet some crazy expectation.

Parent 1: Ben went totally crazy this Easter because he didn't get that race track.

Parent 2: It's time to go Jehovah on his ass. No more fucking holidays ever!

Go Jehovah on his ass by bbone22 September 7, 2012

Balls of his ass 

Experiencing a difficult time, usually financially

Friend: Was that Ray? I haven't seen him in months.
Me: Yeah, he's really on the balls of his ass since he lost his job.

Balls of his ass by Ned Hendershot April 25, 2014

couldn't find his ass with two hands 

Someone who does not have a clue about what is going on around them. A person that has to have jokes explained to them. Even worse, someone that acts as if they don't understand something even when they understand perfectly.

That jerkoff Devlin couldn't find his ass with two hands .

couldn't find his ass with two hands by dempsey4mk July 10, 2006

Pin the tail on his ass 

A horrible and undefinable jail metaphor with a negative inflection. Most likely insuring a murder or rape, or the legendary MurderRape.

YO! I'm sick of this ni**a man! KEV! Pin the tail on his ass!

Pin the tail on his ass by JayHairston October 5, 2011