BITWRATHPLOOB is a modified acronym for "bucktoothed rope-armed troll-haired pantsless wood bear". Since the actual acronym, BTRATHPLWB, isn't very pronounceable, other letters were added to make it more compatible with English.
A word in the language of ninjaish, originating from the phrase "btw" meaning "by the way" can be used in many different forms such as annoyance, agreement, questioning or confused, depending on the tone of voice used, and hand gestures that accompany.