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1.
Used mostly by cooing peers (anyone older than the person in question)

Also

Used by mature people to talk to other mature people (*cough* mature, yeh right *cough*) but talking like young children
1. "Hello, widdle widdle baby!" "Ooo! You so cute! Yes you are! Yes you are"

2. "Yeah! So nnnnn" "No no no waaa" etc etc
by Edmund Townend May 11, 2005
 
2.
the act of post-pubescent individuals speaking like a toddler.
Oh, I just melt when you use baby-speak on me. Especially when you sound like the kid in the Oscar Mayer commercials!
by Bungalow Bill November 24, 2001