self-deprecation 

belittling one's self: the act of belittling yourself or your achievements

She has low self-esteem and is prone to self-deprecation.

self-deprecation by BobTheMan October 20, 2005

Self-Deprecation 

Making fun of oneself for entertainment. It's usually done by people who are depressed, but you shouldn't just assume.

Self-Deprecation is such a common form of humor, even Urban Dictionary itself does it.

Self-Deprecation by Ubeenbamboozledson August 8, 2021

self-deprecation 

Modesty abducted and bound to a pedestal.

I am the king of self-deprecation.

self-deprecation by Master of Disater July 15, 2003

self deprecating 

Insulting; devaluing; or belittling oneself, often in a sarcastic or humorous way.

Young girls are so self deprecating. They never talk about anything but their flaws.

Tate: I have to cancel our plans this weekend!
Lana: Don't worry about it; I'm an expert when it comes to spending weekends alone.
Tate: You're so self deprecating sometimes, Lana.

self deprecating by Kellyisawin! December 2, 2013

self-deprecating humor 

Humor where you put yourself down.
Sometimes funny, but sometimes overused fishing for compliments or a signal of low self-esteem.

ex. 1
Yeah, I just walked into the wall outside *smiles, while friend laughs* man I'm clumsy.
ex. 2
Dang, your're all such good students, studying for the test, I'm prolly gonna fail. *says the straight A student*

self-deprecating humor by andriod5 September 6, 2005

Self Defecation 

a female manipulator band of ~7 members, all of which are in the 8th grade.

female manipulator culture and music is commonly seen in bands like Hole, Destroy Boys, Girlpool, etc.

Gia: Self Defecation just released a new hit single, "shock ya pussy!"

Self Defecation by row man April 21, 2022

Self-Deprecating Defacating 

Lashing out at or making fun of your own Shit

Bruce: I took a shit last night that was so bad, the power grid went down for 30 minutes
Lisa: I believe you just engaged in some classic Self-Deprecating Defacating

Self-Deprecating Defacating by Urban humor May 23, 2019