Exploring the physical act of love with a member of the opposite sex (no gays allowed), but done so with the ultimate respect for the said sexual partner. Ultimate respect that can be given in the hierarchy of superlatives: pie, savage and plough. Also see: pie, savage.
"you would plough her"
'let me explain - my son would like to plough you.
In the video game The Witcher 2, you will often hear enemy soldiers shout that sentence. Lilies are the emblem of the kingdom of Temeria. In essence "Plough the lilies" means "Fuck the Temerians"
Bar patron: Look, Temerian soldiers!
Other patron: Plough the lilies!
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.