"Snu Snu" (in Spain: Kiki) simply means "performing the sexual act (copulation) with a amazon".
The origin of this meme is the American animated series Futurama (in Futurama - SE3-EP05), when the protagonists arrive at a society totally matriarchal inhabited by robust women of 2.5 tom 3.5 meters (they fall within the definition of amazon and mini-giantess).
In that society, one of the punishments is Death by Snu Snu, which consists of a painful (and pleasurable) copulation with the heavy bodies of these women to the point where the "condemned" dies by spraying his pelvis.
However, the meme has different meanings inside and outside the GTS community:
Outside the GTS community
Inside the GTS community
|( ) -- Fanaticisms and rare tastes -- ( )|
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|Rare and unknown|