What is Shellback?
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A US Navy tradition that occurs when a ship crosses the equator. Any sailor or Marine who's first time passing the equator is subjected to a hazing ritual called "Shellbacking."
When I sailed with the 15th MEU out of Camp Pendleton I got Shellbacked.
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1)a vagina that may be dirty, stinky, worn out, or not-so-fresh. It has been like that for so long, it just doesn't stink it stank..
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when your roommate cock-blocks you inadvertently, just because he/she lives there and wants to go to sleep, making it not really his/her..