double talk

Short definition from Wiktionary

Noun

1. 1
   Doublespeak.
2. 2
   Lies, especially in a formal political statement.
3. 3
   Speech which combines English (or some other language) and native-sounding gibberish for humorous effect.
4. 4
   A simple phonetic code with a regular infix that makes meaningful speech sound unintelligible.
5. 5
   A situation when two people talk at the same time, causing overlapping audio signals.
6. 6
   Alternative form of double talk.