to do anything with a family member which would be deemed sexually deviant or incestual.
Alfred: Hey did you hear about Bill and his daughter?
Franky-Joe: Yea i heard he went pine grove on her, wtf is up with that?
when a group of people that are related (usually men from pine grove) gang up on some one and proceed to funk the sheet out of them.
Yo Bill if your done with her do you mind if me n the guys go family style on her