Modus Operandi

Fly-by-Night: Unreliable or Shady Businesses
Originally referring to a swindler who fled hurriedly from a business situation after his modus operandi had been discovered by the locals, it now refers to a shady business, often operating out of a post office box or accommodation address, that cannot be located when its merchandise or product proves unsatisfactory.
MO: Money Order and Modus Operandi
MO can refer to Money Order, a financial instrument, or Modus Operandi, referring to operating method.
Modus Operandi (MO): Manner of Operation
Modus Operandi (MO) refers to the characteristic method employed by a person to accomplish an act, especially the means adopted by individuals in specific activities, often emphasizing the way someone operates in business or other dealings.

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