A chain of logic with ends so remote that to anybody else it seems to be completely unrelated. Like a wiki walk, but through your head, and there's no history.
Example of a non sequitard:
Alice: Hmm... I think Grassy Knoll Dew would be better than Mountain Dew.
<pause>
Bob: Would walruses fight for us in the zombie apocalypse if we gave them buckets?
Bob: Don't even try to figure out how I got there.
1. Latin phrase roughly translating as "doesn't follow" (think: not-in-sequence), i.e. 'non-sequitur' describes something that doesn't follow on from the preceeding information or context. Often used as a form of humour.
(adj) describing a random statement or conclusion that has nothing to do with the statements made prior to it.
Several family members are discussing what to have for supper: "spaghetti? hot dogs?"
when Bill Doe says, "we should hire rodeo camel trainers to help us uncover the secrets of the Bermuda triangle!!"
His statement does not relate to any of the previous statements, and thus is "Non Sequiturious."