SSDG
Same Shit Different Guy, or alternately, Same Shit Different Girl; this is an updated version of SSDD to reflect that said shit is actually related to a shitty relationship
Girl 1: Hey, how are you and whatshisface?
Girl 2: Meh, you know... SSDG.
Girl 2: Meh, you know... SSDG.
SSDG
Same Shit Different Game
Person 1: Hows the new Call of Duty?
person 2: Its SSDG
person 2: Its SSDG