Definitions by Kellyisawin!

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