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