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.