GGSS in the Philippines means "gandang-ganda sa sarili" (is so pretty to herself) for girls and for boys "gwapong-gwapo sa sarili" (is so handsome to himself).
Girl: Ang ganda ganda ko!
Girl 2: Wag kang masyadong GGSS.
by October 31, 2018
Stands for Guwahati Gana Seva Society, a social service organization in India
ggss-guwahati .org is the website address
by mmvsofts September 3, 2019