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slang A humorous, unofficial motto used by United States Marines, taken to mean "Always Flexible." A play on the animated clay character "Gumby," known for his bendability, and the actual Marine Corps slogan, Semper Fidelis ("Always Faithful"). You've got to learn how to adapt when you're in the Corps, no matter what the situation throws at you. Semper Gumby, right?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.