Is hangry a real word? According to Collins Dictionary it means to be angry as a result of being hungry, but it seems far-fetched.
If it's in a dictionary, especially one with professional full-time editors, the chances are it's a real word. Of these kind of dictionaries, I can only find it in Collins, and their webpage notes it's "humorous" and also added from a recent suggestion:
Collins also say:
You can find it used on Twitter, although often with an explanation it means hungry and angry.
The earliest hangry I found with this definition in Usenet is in rec.games.trivia from 1996:
So it appears to be used as humorous slang, and you should only use it as such.
It is slang, but it's become commonly accepted slang...though not commonly used. According to the Urban Dictionary, it means:
I found several other sites which used similar definitions...and in fact, it's the most logical definition I could think of.