To be called a three means you are stupid. that you dont understand concepts of which someone would be talking about and your pretty much the biggest dumb fuck the person calling you a three has ever met.
when asked what the word three means, dont tell the asker. theyre not supposed to know. the word could mean anything you would like it to mean, whether it be a sexy beast or flamming homosexual. but the person doesnt know it, so its descising your real thoughts.
calling them a three will make them look like a dumbfuck in two ways: pretending they know what it means, or getting extremely confused.
Dan: "Your such a fucking three."
Lillian: "Shut up you three!"
Dan: "Your a cunt too!"