Def.: Originally a semi-thoughtless description of what peacocks do in courtship, i.e. flashing their “butt feathers” (it was the morning and I wasn’t thinking), in this context used to describe human attempts to assert masculinity (and its subsets prowess, dominance, and capability).
Usage: This morning I watched through the car window as my dad and a roadside attendant argued about tire chains; butt feathers were everywhere.
–your fangirl heroine.