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2.
yes, i'm hearing what you're sayin, but NO you're fuckin wrong
westy bumfuck: this lion reds a good drop eh
anyone else: yeahnah i prefer teh stein's
by o_0 December 01, 2003
 
1.
said : yeah.... naaaaaaaaaaaaaaaaahhhhhh
used when you are in a conversation and you kinda get what the other person is saying but dont quite agree with what is being said, or dont really give a shit.
cuz: hey bro, did you borrow my bloody car?
bro: yeah nah , i think it was the other guy
by weazzellboi August 15, 2007
 
3.
Yeahnah. The most common form of Australian slang that is the short form of 'yes, but no'. Commonly used to respond to a mate during conversation, when you are aknowleging what was just said in a conversation, but you have a different view or opinion and are about to express said view or opinion. Also used to express a state of appathy or ambivilance.
"Hey mate, it's a great day to go fishing hey?" and mate responds with, "yeahnah". This means yes it's a great day for fishing but something else is more important. Not limited to fishing conversation but used in all discussions about anything.
by Chief Judge February 19, 2013
 
4.
New Zealand slang, strangely enough, meaning yes.
"Did you come home alright?"
"Yeah nah, sweet as."
by Victoire Croire May 02, 2008