Originating from the term "soggy box" usually used as an insult. This would be used for people you wouldn't give the time of day to, let alone use full words.
"Look at that fuckin' Sog Bog" or "You're being a Sog Bog"
A flat ass. Similar to SpongeBob. You can wear the tightest pants and your ass will still be flat.
Jillian has a sog bog.
Steven’s crush has a sog bog.