a shorter way of saying "me cago en la leche de la puta que te date la luz", meaning "i shit in the milk of the whore that bore you," a very common insult in spain.

The sort of thing I learn in spanish class.
"I don't like Harry Potter."
"Well then, me cago en la leche."
by maddymaddymaddymaddaaaay December 7, 2004
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