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1.
The unwanted build-up of people standing/mingling in hallways of schools, offices, and public places that causes restriction of the flow of people.
"Sorry I was late Mr. Turnbaum, I got caught up behind some Hallway Cholesterol."

"Due to the amount of hallway cholesterol at my school, I have been late to class every day this week."
by ParCib9494 October 18, 2011