Every Friday is a Fright!
Allegorically, one who takes an opposite position for testing a contention, or just to be perverse. The term 'Devil's advocate' was brought into English in the eighteenth century from the medieval Latin expression 'advocatus diaboli'. To describe someone as a Devil's advocate now is to suggest that they are mischievous and opposing, being opposite for it. In medieval Europe, Devil's advocate wasn't seen so contrarily; it was, similar to "chamberlain" or 'cordwainer', a vocation title. There are various mentions in Vatican records dating from the mid 1500s of a casual part called 'Diaboli Advocatus'. In 1587, the administration of Pope Sixtus V (disappointingly, there hasn't yet been a Sixtus the Sixth) established the formal post of Promoter of the Confidence, referred to informally as the 'Advocatus Diaboli', which surely must have been the same part as 'Diaboli Advocatus'. The set of working responsibilities wasn't especially onerous, until the point when someone was assigned for either beatification and canonization, and soon thereafter the 'Devil's Advocate' was required to draw up a list of arguments against the chosen one getting to be plainly blessed or consecrated. The first occasion when that the present type of the expression was used in print appears to be in the 1760 humorous content Impostors Identified: By rising up and having the genuine impact of the Devil's advocate.