Same here. I was afraid that maybe nobody said anything and I'd have to be the one to say it first.

What country are you from? I would consider "tiddies" to be a somewhat strange misspelling of "titties".

Compare https://en.wiktionary.org/wiki/titty_bar .

It’s internet slang. Looks like the earliest urban dictionary entry is 2012.

https://www.urbandictionary.com/define.php?term=tiddy

just for the record, nitty gritty has become niddy griddy