Field fucking 

Where a couple runs onto a football field during a game usually at half time and has public sex on it.

Did you see John and Kathy field fucking?

Field fucking by Deep blue 2012 June 24, 2010

Field-Fucking 

The act of getting involved with a particular practice in the environment in which the practice is typically performed.

Harold: So Llyod, I heard that you're going to be filming the football game tonight for your video class!

Llyod: That's right Harold, it should be some mighty-fine field-fucking!

Field-Fucking by JavaTheMocha October 9, 2010