(background) A schwa as stated in the dictionary is an unidentifiable sound. The phonetic symbol used to respresent the sound.
A schwantz is an unidentifable person wandering aimlessly through life. They are not introspective. They do not know how they affect others by their actions yet they beleive they are right. They will defend their actions to the n'th degree no matter if they are 100% in the wrong.