what's-her-tits
A phrase to refer to a girl when you can't remember her name, similar to what's-her-name. Also the feminine version of what's-his-nuts.
What's-her-tits left her shit here again, I hate it when she does that!
What's her tits
The female equivalent of "what's his name?" when trying to remember someone's name.
Oh my God, like that girl we met at that party...you know?...What's her tits, there.