1 or more person(s), usually sightseers, walking slowly in a busy urban environment so as to prevent others from passing.
Due to their sightseeing nature, The Sidewalk Sloth often doesn't travel in a straight line and can impede passing in other ways (e.g. pointing at things, changing direction while lost). These behaviors can lead to injury of for fellow sidewalk users. It also allows fewer practitioners to block the sidewalk than the Sidewalk Snail Barrier.
*see also the iPod Sloth
Sorry, I'm late. I got stuck behind about 5 different Sidewalk Sloths on the way here. Is it tourist season of Something