23 terms only Marines will understand

Marines speak a slightly-different language than the rest of the United States.

While everyone in the Corps speaks and uses English most of the time, there's another layer of terminology added on top which is uniquely Marine. If you are around Marines long enough, you'll hear someone being called a "boot" or dozens of them screaming out "yut."

This is what it all means.

"Rah." or "Rah!" or "Rah?"
Short for "Oohrah," a Marine greeting or expression of enthusiasm similar to the Army's "Hooah" or the Navy's "Hooyah." Rah, however, is a bit more versatile. You could be agreeing with someone, by saying "rah." You could be excited about going on a mission by exclaiming, "Rah!" Or you could be asking the platoon if everyone understands, "rah?"

It's like the Marine version of the mobster's "fuggaddaboutit."

"Errrr."
This is an even more shortened-down version of "rah." But it's most often used as a lazy-man's version of agreement. Your platoon sergeant may ask if everyone understands the plan of the day, to which everyone will respond with "Errrr." Translation: Yeah Gunny, we got it.

"Yut."
Arguably used more often than "Oohrah" by junior Marines to express enthusiasm. Instead of "oohrah," Marines will often just say "yut" when in the presence of motivational speeches and/or talk of blowing things up.

Semper Gumby
A play on the Marine Corps motto of "Semper Fidelis (Latin for "Always Faithful"), Semper Gumby for Marines means "Always Flexible." This phrase is often used when you are told to do one thing, then told a different thing, then told to just stand by, then told to go back to doing the original thing. "Semper Gumby, bro."