Butterface: A woman who's body is disproportionately more attractive than her face. In succinct, politically incorrect terms: Great body, ugly face. Note on pronunciation: Some folks refer to this as a buttaface.
Orion: I'm taking that flirty woman home with me tonight!
Jack: The butterface 
Man, you drank more than I thought!
Orion: Alright jackass, have fun masturbating! I know that butterfaces are d-i-r-t-y in bed and I am going to get some tonight!
Here's another thread for these types of pictures:
https://forum.oneclickchicks.com/showthread.php?t=63656