DEUCES means "Bye" or "Peace."

What does deuces slang mean?

(African American Vernacular, slang) Peace; goodbye (because of the associated gesture holding up two fingers)

What does putting up the deuces mean?

— everyone is throwing up "deuces" these days when posing for a picture. Whether you mean it as a sign of love from one friend to another, or you're a celeb trying to signal the paps to scram, the peace sign has evolved into something completely new and fun.