What is considered a troll build?

I have had players tell me I am trolling because I will get cull and ancient coin. Usually when i begin I always get gold producing items and i figure cull will make me focus on cs as I usually get rid of it as soon as I have 100 creep kills. I figure if I am intentionally trying to lose the game than I deserve to be reported. If I am simply trying out a new build than it is different. For example I figure if I am Ryze the opponents are going to focus on magic resistance so if I build up ad it will cause problems. The same if I decided to go Tank brand. Playing builds that are not expected might win games. I figure experimenting with new builds in a non ranked game is a great idea and is not trolling. WHat do other players think?