adverbinformal US, Australian, New Zealand
1Far away; far to the back; specifically in a remote rural area. "from wayback": from a remote rural area.
2Long ago. "from way back": from long ago; since long ago; (in extended use) through and through.
adjectiveUS, Australian, New Zealand
1 informal, rare That originates from, or is located in, a remote rural area.
2 informal Far in the past; ancient, old.
nounUS, Australian, New Zealand
1 informal, rare A person inhabiting or coming from a remote district.
2 informal Usually with the. The Australian outback.
Mid 19th century. From way + back.