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1.
The first massive gathering of college freshmen after about half a semester at college. Sometimes occurs on Columbus Day weekend, more often Thanksgiving weekend. Named because everyone attending is wearing a hoodie representing their respective college/university.

Pastimes include embelishing college experiences, reminesing about high school days, and hooking up with old high school crushes.
My favorite hoodie party game is "Which chick gained the most weight?"
by JakeStar November 19, 2005
 
2.
A party consisting of college freshmen that only wear hoodies to represent thier college. These parties take place early-October. late-November
College freshman 1: Dude let's go to that hoodie party on Saturday!

College freshman 2: Oh yeah dude *BONERD*
by DizzyLizzy November 15, 2006