I consider myself fluent in emoji, so this Poltergeist app is right up my alley. And with the recent addition of new options, you've got a bigger vocabulary to work with. Basically, this app acts as a secret emoji code messenger so no one can read your messages over your shoulder — unless they know how to crack the code! Messages appear in emoji code until you "unlock" them and read the text when you're ready. With Poltergeist, you can set a timer so that messages and photos self destruct after a designated amount of time.
Poltergeist emoji code messenger (free)
Available on Android and iOS