Flatulence occurring underneath covers such that it affects all others underneath those same covers, either by smell or vibration through the mattress.
Just before I got into bed last night, Ken let out two depth charges. I had to use the covers to separate the airspace between us because the smell was so bad.
So you're fucking a girl (or guy) from behind, you pick them up while you're fucking them, you jump in a pool., as you hit the water you come all up in em. Depth charge