As Kuro said below, gua (melon) is an insult meaning stupid (though in Sichuan it is used to mean a drunk, and this song is specifically about drunk foreigners, or party boys/fuckboys, who come to Chengdu to harass women). Xie Di is from Chengdu, all the best Chinese hiphop is from CDC or Xinjiang (in my opinion).
As Kuro said below, gua (melon) is an insult meaning stupid (though in Sichuan it is used to mean a drunk, and this song is specifically about drunk foreigners, or party boys/fuckboys, who come to Chengdu to harass women). Xie Di is from Chengdu, all the best Chinese hiphop is from CDC or Xinjiang (in my opinion).