The word "Geed" is a vernacular term that is commonly used in the Southern United States to refer to the command given to a horse to go faster. The spelling of this word might seem a little unusual, but it actually makes sense when you consider its pronunciation. In IPA phonetic transcription, "Geed" is spelled /dʒid/, which reflects the way it is pronounced with a hard "g" sound and a short "i" sound. This pronunciation is consistent with many other American English words that use the combination "gee" to indicate a command to horses, such as "gee up" and "gee whoa."
The word "Geed" is believed to have originated from American college fraternity slang. It is a truncation of the word "GDI", which stands for "God Damn Independent".
In the fraternity and sorority culture, "GDI" is used to refer to individuals who are not affiliated with any Greek organization. It is often used as a derogatory term to mock or belittle them.
Over time, "GDI" evolved into "Geed", likely influenced by the sound of the truncated word. The term "Geed" has spread beyond the Greek community and is sometimes used more broadly to refer to someone who is not part of a specific group or subculture.