I'm tired of litigating this point, but if you say 7 or 8 things that are very likely but not quite certain to be lies, it's essentially certain that at least one of them is a lie.
Re slang, groups of friends in HS often come up w/ their own private vocabularies—nicknames,terms based on inside jokes,etc There is no reason, eg, that BK and his friends couldn’t have played a drinking game that they called Devil’s Triangle. Urban dictionary can’t answer this