Top Definition
Two toddler siblings take a shared bath. While one contentedly entertains himself, the other stands up behind him and urinates on him.
I only turned my back for a second; when I turned around Manual had initiated a Nicaraguan Sibling Surprise on Isabella. She lucky that he only peed on her back.
by Crack Jacky September 02, 2009
5 Words related to Nicaraguan Sibling Surprise

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