My girlfriend in college had a roomate who used to speak in a "secret language" that was very similar to baby talk. It was all words ending in -y and cutesy. She would use this language to have private conversations in public places. She would talk loudly to other brain-dead trollops in a language that sounded like a drunk four-year old about who she had slept with the night before or whatever.
Every time she started in with this ingenious tactic, I had to leave lest violence occur.