A swedish abbreviation for "you know it, honey" (in sweden we say "honey/babe" depend on the gender.)
Det vet du, gumman/gubben=You know it, honey
gumman=honey/babe to a girl
gubben=honey/babe to a guy
Friend 1: "You will totally win this shit!!!"
Friend 2: DVDG
Lover 1: "You'll be always by my side, right?"
Lover 2: DVDG