Azn is likely misspelled.
Azn has no English definition.
As a noun azz
is {{cx|AAVE|slang|lang=en}} ass; backside.
azz
English
Noun
(es)
ass; backside
References
* Google Books: [https://www.google.co.uk/search?tbs=bks%3A1&tbo=1&q=%22dat+azz%22&btnG=Search+Books&gws_rd=ssl]
azn
English
Abbreviation
(Abbreviation)
(head)
Asian (associated with )