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"Simpo" is a derivative of "Simp." Originally short for "Simpleton," a simp is traditionally defined as someone (usually a man) who does too much for someone (usually a woman) who does not reciprocate his romantic or sexual interest. However, language evolves. "Simpo" adds a playful, almost clumsy suffix, softening the original accusation of desperation into something more self-aware and chaotic. A "simpo" is a simp who knows they are a simp and has decided to make it everyone else's problem.