The offensive strong odour of many varied clashing aftershaves and perfumes, emanating from a group of people on a night out together. Combined into one unholy stink, this stench often catches you unaware, and chokes you as you walk down a street.
It is a cluster pong. You have been cluster ponged.
'Holy cow, I walked right into that cluster pong, and now my head hurts.'
'Lets cross the street, there's a Hen party ahead and I can't breath in that kind of cluster pong, I only have two lungs.'
'I would love go out drinking this Friday night, but I can't handle the hellish cluster pong. Can we make it Monday morning instead?'