Short for "Semper Fidelis" (Always Faithful), Semper Fi is the phrase used in every day conversation between Marines rather than the longer, more cumbersome phrase which likely confuses many grunts. It's also a lot easier to use in cadence calls and other chants, such as this beauty from Full Metal Jacket:

"Do we love our beloved Corps ladies?"
"Semper Fi, do or die, gung ho, gung ho, gung ho!"
"What makes the grass grow?"
"What do we do for a living ladies?"

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