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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.
by Matt_usmc August 21, 2006
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A Shellback is a Pollywog that has gone through The Crossing the Line Ceremony. Sometimes referred to as Sons of Neptune.
I became a shellback when we crossed the line on our way to Australia.
by xNilx February 09, 2010
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