It is like planking as it can be done anywhere and you can try and outdo other slookers slooks, take photos and upload them to socal network sites, blogs and picture boards (facebook, 4chan, twitter, tumblr, myspace, etc).
The first slook ever done, with evidence, was done by Mike Wallace on 60 minutes. The main purpose of this was to troll planking.
A person on your team who fucks up the whole game by getting hit by a car or any hittable, thus making the three people have to carry him. e.g Left 4 Dead 1 / Left 4 Dead 2. -Skilled <3's Scanty