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-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

self-deprecating surrender

saying the opposite of what you mean to appease someone else due to low self-worth

Can't a happy conclusion be reached without her self-deprecating surrender?

self-deprecating surrender by swthrt628 October 21, 2011

Depreciating Asset 

A prominent butt that in twenty years will be only a shadow of its former glory

Mike: Hey that girl has a fine ass.......
Steve: Yea, but wait a few years and it will be a totally Depreciating Asset.....

Depreciating Asset by hokie89 October 15, 2011

Self-deprecating humor 

A type of extremely stale humor, mostly used by youtubers to deviate criticism, desperately make a joke, make up for bad quality of videos and/or appear naive to an audience.

Youtuber: hey guys sorry for the low quality of videos for the past years and the constant manipulation of my subscribers, but hey i’m dumb and i have a small penis, so what did you expect LMAO

Audience: oh that doesn’t matter, we completely forgive you, you used self-deprecating humor and clearly see your faults!

Self-deprecating humor by pphard September 29, 2018

Degredating 

Degredating (verb) Going on a date or actively dating someone who degrades you. Originally coined accidentally by Jimmie Whisman in a Small Town Murder episode.

Oh no, Jane is degredating Jim again, that asshole who constantly puts her down.

Degredating by ggirlcolo July 14, 2019