self-deficating humor 

When you laugh so hard you shit yourself.

John's self-deficating humor was so potent he cleared the room.

self-deficating humor by Skidmarkers March 30, 2016

self-defecating humor 

The act of getting some cheap laughs by pooping one's pants.

Billy's lame jokes kept falling flat, so, desperate for a laugh, he decided to change course and try some self-defecating humor.

self-defecating humor by Lord Nexus VI November 27, 2012

SELF-DEFECATING HUMOR 

Not to be confused with self-deprecating humor, self-defecating humor is NOT funny. A joke that bombs like a dump of crap.

Example: A joke about your own foibles that stinks!

Sorry,Man, I hate to admit it, but I like PB&J with bacon even though it always gives me gas. (Your admitting that is self-defecating humor.)

Too much information, Dude!

SELF-DEFECATING HUMOR by sizcruz January 22, 2010