Happens when you send the wrong emoji in a text, constituting an unintentional error regarded as revealing subconscious feelings.
Similar to the Freudian Slip, but with Emojis rather than words.
"Damn, I accidentally sent her a heart Emoji"
"That's definitely an Emojian Slip on your part"
when you send the wrong emoji. or an emoji that you meant to send to someone else.
I sent my ex-wife the smiling emoji with hearts for eyes, I meant to send it to my current girlfriend. That was quite an emojian slip...