SGAPN or Stupid Gay Ass Pinoy Niggas was popularized by "The Angriest Doc," Dr. Ronald S. Torres. It is used to counter-attack a filipino gay who’s spreadingnonsense against you.
Sgarnon is an abbreviation of "Whats Going On". This term, when spoken phonetically works best with an Australian accent, spoken with a more nasal tone to give it that extra edge. It is also acceptable for this term to be split into two words; Sgarn On