Things went totally postal for Jake Peralta and company on Brooklyn Nine-Nine Season 2 Episode 8.
Kind of. Sort of. Maybe.
It's become unclear just what going postal means after Ed Helms guest-starred on the Fox sitcom as Jackie Danger, a U.S. Postal Service investigator who took a great deal of pride in his job.
In Danger's mind, working for the USPIS means you're several steps above of "local cops" such as Peralta, considering you're a federal employee and everything.
This caused great tension between Jake and Jackie, so much so that Jake disobeyed Rosa's orders and went rogue (with loyal right-hand man Boyle, of course), stealing some intel from Danger's computer and going off on his own to bring down a Giggle Pig dealer.