Cosplay of bikers

The collective noun for a large flock of Harley-Davidson riding bikers, typically wearing an assortment of non-protective leather accessories, including assless chaps, fingerless gloves, badge-laden vests and novelty helmets. Chains are also popular. Most commonly found roosting in seedy bars.

For examples of collective nouns for other creatures which flock together for safety, see a "murder of crows" or an "unkindness of ravens.

See also a "noise-pollution of bikers."

Man, I was out hiking yesterday, it was so peaceful until that cosplay of bikers came by revving and scaring off all the wildlife.