I'm not entirely sure what it means enough to give a summary.
The first usage that pops into my mind is when someone has said a silly joke regarding your situation and you want to acknowledge the joke but also move on quickly.
Second usage is someone has suggested something, you want to say you understand but you have a different opinion.
"Yeah nah" - Australian proverb
Ohhhhhhh... That's way the Juicy Media Honest Government ad use it that much !
I like it and use it sometimes myself !
I'm not entirely sure what it means enough to give a summary.
The first usage that pops into my mind is when someone has said a silly joke regarding your situation and you want to acknowledge the joke but also move on quickly.
Second usage is someone has suggested something, you want to say you understand but you have a different opinion.
thonk