look up any word, like thot:
 
1.
SDG
single digit great-when a person gets a single digit amount of greats on a song of DDR
i got a sdg on max 300 only 8 of them...thats frickin amazing!
by Jonathan April 25, 2004
 
2.
SDG
Super Duper Gay
That fair is so SDG

Wow you're bag is so SDG

I think that fella is SDG
by cowgalnumbaone October 30, 2013
 
3.
SDG
Super Dimensional Guard

The force that has a base in the sky and is very secretive. They work to keep the dimensions stable and to maintain the peace of Neotopia.
The SDG base hangs from a sattelite.
by Dogman November 30, 2003