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AnnaLaysChips
There's nothing really that means exactly "laughing at oneself," as far as I know, but some related words are self-ridicule and self-belittlement, though these have a more negative connotation. Hope this helps.
Scripler
Disparagement is a common word used in describing laughing at yourself. Here are a few more.

self-belittlement
self-derision
self-denigration 

That's about it, hopefully that helps!