Though he was no doubt signing nonsense, it turns out Jantjie was signing actual words.
To interpret the fake interpreter's fake interpretations for real, Jimmy Kimmel invited his show's resident sign language interpreter to read Jantjie's signs.
Suffice it to say, it sounds like a hearing impaired version of telephone.
For what it's worth, Jantjie seems to believe his interpretations are coherent.
"I think that I’ve been a champion of sign language," he told a local radio station yesterday. "I’ve interpreted at many big events...if I was interpreting wrong why should it become an issue now?"
[H/T: Laughing Squid]