What is Shellback?
1.
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.
verb. the term refers to the act of walking into a solid wall that was in plain view.
This term is taken from the platform number 9 ..