The act of a man performing oral sex on a woman and finding a condom inside of her from the last man she had intercourse with and sucking it out in his mouth.
"Wet cat in a cardboard box rizz" can be used to describe someone so pathetic and or innocent, that you feel the need to date them, out of pity, or sympathy. Like how if you see a cat abandoned in a box on the side of a rainy street, you feel compelled to pick them up, and take care of them.
"I met this girl the other day, she was so lonely, and stumbled over her words a lot, but I gave her my number, because she had wet cat in a cardboard box rizz."