Yeah = yes a) I understand the question, b) it was me, c) i might agree with what you are saying. Nah = No a) I don't think thats right, b) it was not me, c) there is no useful information i can give you, d)come to think of it, maybe i don't agree with you. I dunno = I'd like to put in a disclaimer and nullify anything I just said. Non committal. Common in Australia.
Did you use my toothbrush?
Yeah nah I dunno.
Is it going to be a nice day today?
Yeah nah I dunno.
Do you want a shag?
Yeah nah I dunno.
Yeah nah I dunno.
Is it going to be a nice day today?
Yeah nah I dunno.
Do you want a shag?
Yeah nah I dunno.
by Bogfrog September 1, 2007
It's just complete confusion and laziness rolled into one. When your really not sure if you want to do something but don't want to give a straight up answer
by Bronzac Burley March 9, 2015