Explinate

Explinate: verb. To explain an explication or explicate an explanation. Linguists have offered this as an explanation for what occurs when people go off on a tangent, that's unrelated to what they were originally talking about. Much study has been devoted to the phenomenon of conversational tangents, and so far this is the only explanation that hasn't been disproved by further research. The basic idea is that, a person will postulate an explanation or idea that links two other ideas, but will feel that this isn't sufficiently explained or will subconsciously feel that that train of thought is more interesting, so will instead choose to explinate, leading to the tangent.