Pluto

Shadowtalk term for the situation where a censor (especially an automated worldnet censor) rejects something and you can't immediately figure out why. Famous examples include the Plutocrats attempt to name their planet Pluto (which was decreed "Not a valid name"), or certain popular music forums refusing to allow chat about group Nonsensemen (because it contains the substring 'semen' and could therefore be unsuitable for discussion in a forum which allows minors to participate).

Among shadownet users, as well as on other online fora (where it may actually be necessary to get around filters), it has become common to replace unexpected profanity with "PLUTO", for example referring to a certain band as "NonsenPLUTO".