This is the 8075th most frequent German word.
ija
"Ija" is not a standard German word. It may be a typo or a regional expression.
Affirmation, expressing agreement or consent
Ija, das könnte klappen, wenn wir uns beeilen.
Yeah, that could work if we hurry.
Confirmation, emphasizing alignment of thought or idea
Ija, ich hätte eine ähnliche Idee gehabt.
Indeed, I would have had a similar idea.
Reflection, acknowledging and agreeing on an experience