A word that is the equivalent of the phrase "requires very much ponder" or, "requires an extreme degree of thought"---possibly of British origin---used as an adjective. In particular, it is used at the end of a sentence as somewhat of an afterthought preceded and followed by an ellipsis (...)
said in a room with people present. This is not the letter ending and indicates that the speaker is trying to describe something too huge to express in mere words.
One loves the webby of BBCR1...Massively....