Babytalk

''I'm sorry. I don't speak...monkey! Banyanya? - Count Olaf, Lemony Snicket's A Series Of Unfortunate Events''

Babytalk is exactly what the name suggests - talking or writing with the coherence and spelling of an infant. This will usually include all r's being replaced with w's, the suffixes -ickle and -oo being added to normal words, and Lust Objects being referred to as petnames like "Plumpycheeks" or "Snugglywoo". It never ends well.

Very, very, VERY common in the fields of Suefics and Slashfics, especially in fic summaries.