A growing phenomenon(in more ways than one), a Butterbody is very much like a Butterface, only it pertains to a girl with a very pretty face and an overweight body.
I see this happening more and more these days.
Me: She's so pretty. Too bad she's heavy.
Buddy: Yep, classic Butterbody.
When one paces their lips between the recipients butt cheeks and blows continuously creating vibrations and a wind tunnel. Butterboat! PLPLPllplplpLLPLPpllPLLPLLPll!!!!
Fun stuff.
I was really into the moment and decided to give the wifey a butterboat. Mmm mmm good!