A small, hardy, naturalized (feral) horse of the North American west.
1903, James Hoyt (editor), Seen & Heard by Megargee, L.N. Megargee, page [http://books.google.com/books?ei=WZnPSbCnCZbyygTzgskR&q=%22He+is+a+product+of+the+merchant+marine%22+mustangs+%22during+the+Civil+War%22&btnG=Search+Books 1754]:
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(U.S., military slang) A merchant marine who joined the U.S. Navy as a commissioned officer during the American Civil War.
1903, James Hoyt (editor), Seen & Heard by Megargee, L.N. Megargee, page [http://books.google.com/books?ei=WZnPSbCnCZbyygTzgskR&q=%22He+is+a+product+of+the+merchant+marine%22+mustangs+%22during+the+Civil+War%22&btnG=Search+Books 1754]:
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(U.S., military slang, generalized) A commissioned officer who started military service as an enlisted person.
1903, James Hoyt (editor), Seen & Heard by Megargee, L.N. Megargee, page [http://books.google.com/books?ei=WZnPSbCnCZbyygTzgskR&q=%22He+is+a+product+of+the+merchant+marine%22+mustangs+%22during+the+Civil+War%22&btnG=Search+Books 1754]:
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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