Mike Tyson's iron buns are quickly backing their way into the cultural zeitgeist ... 'cause at least one musician saw his backside and thought it'd be perfect for her concert.

Alison Wonderland -- a popular Australian DJ -- shared clips from her Saturday night concert in Tacoma, Washington ... and, in the middle of it she gave fans a glimpse at four full moons, all belonging to the former undisputed heavyweight champ.