1. (noun) The mix of a pizza and spaghetti. This meal, the worst culinary decision of your life, may be served in various forms.
a. Pizza with spaghetti on the side
b. Pizza with spaghetti sauce on top
c. Pizza with spaghetti AND sauce on top
2. (noun) Any bad decision which is obviously bad to everyone else but you. May also be used to describe a serious mistake you've made.
1. Waiter: What can I bring you ?
Fool: May I please have some delicious pizzaghetti, with some bruschetta on the side ?
Wise Man: Dude, that's a textbook pizzaghetti !
2. Fool: Tonight, I'm getting wasted !
Wise Man: The drunker you get, the more pizzaghettis you'll make.
The next morning.
Fool: I can't believe I've slept with that chick...
Wise Man: She's so ugly ! What a pizzaghetti !