Somebody who let's you know where/how to easily find something after spending large amounts of time finding that thing.
Originally coined to define School Boy Chad from Pokemon Gold/Silver/Crystal during a Pokemon catching marathon hosted by TheSpeedGamers, where after going through immense journeys to capture a Snubble, School Boy Chad calls you on the Pokegear to let you know that there is a swarm of Snubble elsewhere.
1: Dude, it took me five hours, but I finally found some measuring tape
2: You know, there's a whole bunch of those in the supply closet
1: You are being such a Trollboy Chad right now...