The ripples that propagate across the female hindquarters caused by the rhythmic spasms of orgasm.
Me: OMG! That was a 6.5 buttquake!!
Her: of course, you made me cum so hard I queefed at a frequency that can only be heard by dogs!
Noun. The ripple effect you receive while having doggy style intercourse or slapping a hoe's ass.
I was banging Sheila the other night from behind and she had some epic buttquake.
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