Guaran-tittied is when you are going to be with a female and though you may not engage in intercourse with her, you're at the very least gonna see some tits!
"You gonna get some pussy when you seetiffany tonight?"
"Not sure, but I know I am guaran-tittied."
"That girl is so fucking hot I want to put my fingers between her boobs. Is there a word for that? Oh ya, tittled. Im going to go tittle the shit out of her."