From WikiDub:
"DubYap is the technical terminology or characteristic idiom of the very special religious group known as Jehovah's Witnesses. As philosopher Condillac observed in 1782, "every [religion] requires a special language, because every [religion] has its own ideas ... It seems that one ought to begin by composing this language, but people begin by speaking and writing, and the language remains to be composed." A reminiscence of old trade languages used by people who spoke different native tongues to communicate, DubYap is used by Jehovah's Witnesses who speak different languages and live in diverse geographical regions of the globe.
It has developed as a kind of shorthand, to express ideas that were frequently discussed between members of the group, though it has been developed deliberately using chosen terms taken from their own version of the Bible, the New World translation of the Holy Scriptures, and from several doctrine books published over the years. For example, the term "Blue Bomb" is commonly understood among the Jehovah's Witnesses to referr to the book "Truth That Leads to Eternal Life", published in 1977, which had a deep blue cover, and whose powerful debunking of rival christian doctrines earned it such title. Among the Jehovah's Witnesses, a standard term may be given a more precise or unique usage among practitioners of a field. For example, the term "Pioneer" amongst the Witnesses denotes a publisher of the Good News (TM) that spends a pre-vowed amount of hours in the said service for a period of one month or one year. In many cases this usage of language causes a barrier to communication with those not familiar with the language of the field. For example, often Jehovah's Witnesses use the term "other sheep" in a way that would confound most shepherds, biologists, zoophiles and other experts, since it's used to refer to people amongst their ranks who do not share into the hope of a heavenly call for salvation, but rather, their hope consists in living forever on a paradise on earth. Sometimes, the terms from DubYap are blatantly used in front of non-members as a code, a message hidden in plain sight. An example of this is when engaging in the door-to-door witnessing, and their visit is dismissed by the householder, some Witnesses will audibly deem such person as a "he-goat", a derrogatory term taken from Matthew 25:31-46 as a codename for someone who is marked for eternal doom.
DubYap is largely present in the Witnesses' everyday language, in their publications, official documents and scheduled meetings. Many Jehovah's Witnesses enjoy agressively engaging each other in conversation heavily loaded with DubYap as means to test each other's spirituality level. This has resulted in a few cases of closet apostates [mentally diseased dissenters] to be outed and consequently lovingly disfellowshipped from the local congregation - a temporary mild form of discipline among the Witnesses, the modern- day benign equivalent to lapidation in ancient Israel, which usually results in the repentant ostracized "spiritually dead" member to come back to its senses and return to the herd. "
Eden