noun

• (slang, derogatory) A simple person lacking common sense; a fool or simpleton.
  "Pimps and simps would fall in from here and there and everywhere, grabbing thousand-dollar advances from the madames and leaving their lady friends in pawn."
• (slang, by extension) Someone who is not worthy of respect.
  "The JEWS own this country, the IRISH run it, the BRITISH envy it, the GERMANS cuss it, the NEGROES enjoy it, the FRENCH style and perfume it, the CHINESE wash it, BOOTLEGGERS irrigate it, the GREEKS feed and shine it, the JAPS fear it, MEXICANS hate it, RUSSIANS pity it, the ITALIANS fruit it, ALL NATIONS cigarette it, EVERYBODY likes it, and the AMERICANS—well, those poor simps just pay the bills and can keep out of jail if they behave themselves and are very careful about their driving and parking."

noun

• (originally African-American Vernacular, derogatory) A man who foolishly overvalues and defers to a woman, putting her on a pedestal.
  "Baby got it goin' on / A lot of simps won't like this song / 'Cause them punks like to hit it and quit it / And I'd rather stay and play"
• (slang, by extension) Someone who foolishly overvalues someone else and defers to them, putting them on a pedestal.
  "“Trump simp”."
• (slang, sometimes self-deprecating) An advocate for an ideology or cause.

verb

• (intransitive, slang, of a man) To be especially deferential to and emotionally vulnerable with a woman, often with the intent of receiving sexual gratification.
  "1992, Fatlip (The Pharcyde), Passin’ Me By lyrics Now let me tell you 'bout the feelings I feel for you / When I try or make some sort of attempt, I simp / Damn, I wish I wasn't such a wimp"
• (intransitive, slang, by extension) To obsequiously praise or admire.
• (intransitive, slang, by extension) To reminisce melancholically; to recall once fond memories now tinged with sadness, especially regarding a former lover.
  "2018, mimi (@splendamami), Tweet. the dick can't be that good honey stop simping over that boy"

noun

• (physics, astronomy) Initialism of strongly interacting massive particle.