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1.
1.) Something so foul and horrific that no man in sight would dare approach it.

2.) The fullest degree of ugly.
Example 1.) Did you see the face on that chick? She looks absolutely petrocious! Gross!

Example 2.) (Guy 1): Hey, you've got to quit scratching your balls in public man. Thats pretty petrocious. (Guy 2): Sorry, but they are itchy.
by mdk_dl March 25, 2010