1
general::
Low in rank, least important person, as in I just joined the board so I'm low man on the totem pole. This slangy expression is thought to have been invented by the American comedian Fred Allen about 1940 and caught on despite its lack of application to a genuine totem pole.
American Heritage Idioms
2
general::
Phrase(s): low man on the totem pole
Fig. the least important or lowest-ranking person of a group. • I was the last to find out because I’m low man on the totem pole. • I can’t be of any help. I’m low man on the totem pole.
McGrawhill's American Idioms And Phrasal Verbs