This is a lessrude, subtle approach to curb someones bragadocious behaviour during conversation. It limits the chance of copping a smack in the grill from the offending party.
Hey wigga, i know your missus is a pornstar and your best mate is the lead singer of N'Sync but im sorry unfrotunately i think you might be bordering on bragadocious.
dude1: Man, did I ever tell you about that day I scored the winning touchdown in the playoff game and then nailed the hottest cheerleader later that night?
dude 2: yeah, only like a million times, so stop being so bragadoucious already.
berg·a·do·cious; 1.To be outrageous, crazy, something that is unbelievable not to be taken seriously, remarkable or outstanding. 2. Sexy, appealing, something that you desire. Bergadociousness, Bergadociously.
"You are being so bergadocious, just hand me the remote and no one will get hurt."
"That chick has beradociousness down to a science."
"How could you bergadociously ignore me like that?"