Top Definition
The Eleventh of May. A day of celebration for teenagers of English, Dutch, or Swedish, decent across the U.S. but primarily in Southern California.
Nathanael: "Don't forget about May 11th."
Wesley: "I couldn't possibly, you've only told me like a hundred times."
Nathanael: "Haha."
Wesley: "Don't worry about it, dude. It is Once De Mayo after all. We're totally gonna party."
by George Weasley May 05, 2007
7 Words related to Once De Mayo

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