Toddspeak
In conversation, digressing into extreme and/or unnecessary detail about one’s passion (music, coding, gaming) to an otherwise uninitiated layperson, without awareness or acknowledgement of the listener’s rapidly waning interest or lack of understanding of the subject at hand. (See also Nerdjacking)
One moment we we're talking about Prince and then he decided to Toddspeak for an hour straight about the origins of purple.