fizzling is where you are dating someone you are sick of and instead of breaking up, you become unavailable until that person stops trying to contact you. The relationship fizzles out on it's own.
I think Josh is fizzling me. I haven't talked to him in a week and he hasn't called me back.
The act of simultaneously pooping and ejactulating. Term comes from the combination of the wordsjizz and feces. This usually happens when something is so exciting and/or arousing that it causes one to not only ejaculate, but also shit oneself. Fizzing can often be accompanied by loud outbursts, moaning, and hurried trips to the bathroom.
Jon: "Wow, did you see Ronaldo's goal last night?"
Bob: "Yeah, it was awesome. I saw it on Sportscenter and started fizzing."