Jollies
This was the original nickname of the Trained Bands of the City of London, who provided many of the recruits for the Regiment of Sea Soldiers.

Lobsters
A very old nickname for a soldier and the RMLI (Red Marines from their scarlet tunics) became known as 'lobsters', while the RMA (Blue Marines from their blue tunics) were 'unboiled lobsters', a term seldom heard today.

Bootneck
A term deriving its origins from the leather stock that was worn around a soldier's neck, inside the tunic collar. Sailors used to jokingly accuse Marines of cutting a piece from their sea boots to serve the purpose

Tell It To The Marines
While the popular usage of the saying implies a Marine believes anything, the Corps prefer to feel that the true origin is that Marines who had served all over the world could verify or believe any 'wild' story.