Jokes, inspirational stories, chain letters
, quizzes, brain teasers
, and similar unwanted email
received in large quantities, typically as forwards and often sent by individuals from one's address book
and therefore able to bypass most spam
filters. (From a Monty Python sketch where highwayman Dennis Moore inundates a peasant family with a large quantity of lupins stolen from the rich).
I just checked my email, and there must have been twenty lupins from my mother alone.