Pipe Humping
The action of having sex while in a playground crawling tube because their was just NO WHERE ELSE TO HAVE SEX.
Yeah, me and this girl were at the park, and after a while she was like, 'Let's get it owwwwwwwwwwwwwnnnn.' But, being in a playground, we ended up Pipe Humping at midnight stark naked and freezing our asses off!