People that show up to eat your food, drink your booze, smoke your weed, have a good time and then move on to the next party. While the good times roll, they are your best friends, but are no where around to help clean up the mess in the morning. A true friend will call you a dumb fuck, and try to help you deal with the mess your in, a party friend doesn't know you.
A party friend will borrow money from you, but never loan you any, it's rare if he ever pays you back.
A friend that you will go party with, who is always ready to party as hard as possible. He will know the best places to go and to enjoy the nightlife!
I'd like to have fun tonight, I should call my party friend!