Sugarplum is an automated spam-poisoner. Its purpose is to feed realistic and enticing, but totally useless or hazardous data to wandering address harvesters such as EmailSiphon, Cherry Picker, etc. The idea is to so contaminate spammers' databases as to require that they be discarded, or at least that all data retrieved from your site (including actual email addresses) be removed.
Sugarplum employs a combination of Apache's mod_rewrite URL rewriting rules and perl code. It combines several anti-spambot tactics, includling fictitious (but RFC822-compliant) email address poisoning, injection with the addresses of known spammers (let them all spam each other), deterministic output, and "teergrube" spamtrap addressing.