Douchebrag

both the act of boasting about douchey things (how may girls you have slept with, beers you drank, how you mistreated/condescended to a girl, etc.) and/or the douchey manner in which it is done (lack of consideration of volume or environment in which it takes place).

Douchebrag (v.): "Johnny just got back from spring break in Cancun. I can't listen to him douchebrag for one more second."

Douchebraggery (n.)

Includes but is not limited to:

Conversing loudly in public about having sex with a girl, at a volume intended for people outside of your group to hear.

Trying to look cool by bragging about how many beers one drank, or intentional degradation of a female.

Using unnecessarily degrading terms in conversations intended to impress.