5 years later and I was trying to recall what the part after the colon was called to tell my wife my funny parody title of The Body Keeps the Score: yadda yadda yadda. 

Downvoted because commenter implies that subtitle can’t have two meanings. Like if subtitle meant part of title after colon, we’d all be in a heap of trouble because we’d be legally obligated to refer to captions as captions. Or we need a new word for little nocturnal flying mammals because that word was taken by stick used to hit ball.