I gather it was an expression of disbelieve about you not knowing or accepting the wonder that emojis is. In emojified parlance it would sound like "Are you [http://emojipedia.org/pile-of-poo/] me" as in "Are you shitting me", which as you see is very clever, because you don't have to type the whole word and the pile of poo also has cute eyes.
http://thenewinquiry.com/essays/the-conservatism-of-emoji/ - this is of you :)
"Innocuous and omnipresent, emoji are the social lubricant smoothing the rough edges of our digital lives: They underscore tone, introduce humor, and give us a quick way to bring personality into otherwise monochrome spaces. "
"Innocuous and omnipresent, emoji are the social lubricant smoothing the rough edges of our digital lives: They underscore tone, introduce humor, and give us a quick way to bring personality into otherwise monochrome spaces. "