(名詞) 自承缺點或錯誤、但卻是明貶暗誇的言論，因為他或她的話中透露出自己有足夠的信心克服這些缺點或錯誤。
引句：
The latest form of boasting is being called the 'underbrag' — whereby you tweet something so slovenly or shocking, it shows that you simply don't care or have to worry about losing your job/friends/partner.
—Claire Cohen, "Louise Mensch: hypocrite, self-promoter and now fashion guru," The Telegraph, February 13, 2013
There are a lot of different kinds of brags: the humblebrag and the underbrag, for example. However, only one kind of bragging is not only acceptable, but encouraged: the shirtless brag.
—Sarah Anne Lloyd, "Which Star's Tour Workout Has Worked Wonders on His Physique?," Wetpaint, December 20, 2013
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