"Tits on my ass!"

It's when you're fooling around and you get in such a position that her tits are actually on your ass. This is not great for easy access stimulation since it is a awkward position, but erotic nonetheless. It can also be used as an expression of grief, since it reminds one of better times.

Basically, Tits In My Ass (or TIMA) is a way of saying "Shit!" or "God Dammit!" or any other exclamation in a much more interesting and fun way. Generally when you say it, it helps lighten the mood, making your situation a little better. This phrase comes out of Northern California, making up for them inventing "Hella" and "NorCal"

To be bothered, or to be in a bad situation. Tits-in-my-ass is used to express anger. Similar the word "fuck", except it provides more syllables for the user to scream it out in anger, allowing them to yell it for a longer periods of time.

You yell this after stubbing your toe, or when something bad happens, or if something is to expensive. like the equivalent of shit, or son of a bitch. This is just a much more fun way of showing your cussing knowledge.