Petersburging 

Hooking up with your girlfriend in the back seat of your buddy's car as he drives you both home. It takes a true bro to allow another bro to Petersburg.

Christy and I were Petersburging last night as Andy drove us both home

Petersburging by Igotpetersburgedon January 11, 2011

petersburgian 

A person or thing originating from the famous English city of Petersborough

That's a very petersburgian accent you have

petersburgian by BigUrbanDick December 23, 2014