The term was used in a chat and I can't find the meaning.
ちわ is an abbreviated form of こんにちわ, when written using hiragana。
In many Japanese words we can't tell what a word means unless it is written in kanji because there are many homonyms. It could be a girl's name, but it could also mean a conversation between a couple. For example, if it is 痴話げんか, it means "An argument between a couple". Hope that helped.