Confused party: Err, I don't know, Err.
Jibber Jabber: Jibber jabber jibber jabber 7.15 jibber jabber.
Confused party: Mate, I have no clue what you are talking about!
2. adj. Word used to describe incoherent speech
3. v. To speak inchoherently
Dave: No, I dont understand quantum mechanics, so it all sounded like jibber-jabber to me.