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Depending on the user or situation it can have various meanings. For other users' interpretations, read the other definitions.

MY MEANINGS:

1. Can be a harmless sarcastic response to a silly question or statement for emphasis. Never meant to be bitter.
2. Said in retort to an incredibly dumb question, no extra wording, but unlike in 1, the question is borderline idiotic or stupid instead of just silly. The response is said with a scathing tone. In internet forums the tone can be (usually NEEDS to be) replaced using elipses (...) or smilies.
3. Said in emphasized agreement or (once again) sarcastic response to a comment (the sarcasm is usually applied when the question is a burn).
4. An emphasis to a statement or set of statements to show just how... ANYTHING an implied situation is (usually the implied situation is bad and will result in failure if ever attempted).
(1.) Person A: Will Doom 2 work on Windows XP?
Person B: Lol, yeahno, sorry buddy.

(2.) N00b: i cn sendz dizz 2 bot 4 mod helpz?
Chat Member: .....Yeahno. |:|

(3.) Guy 1: Hey do you think Johnson's gonna land that chick for Prom?
Guy 2: BWAHAHAHA, YEAHNO.

(4.) So, you go into the dungeons of this castle, and you come across this sign. It says "If you go into this cavern you will face a gigantic fuck-off dragon that breathes liquid magma". Then you're given the choice to either advance or retreat. With the description I got? I'm thinkin' "YEAHNO!"
Yeahno by Sonikkun the Blaze January 13, 2009
Related Words
Aussie-Kiwi slang of unknown origins. It is the answer to a question where the answer could be yes or no. Or where the answeree simply changes their mind halfway through answering :d
Q did you get laid last nite
A yeahno, but i was this close to a BJ
yeahno by dude_zeon May 14, 2004
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
yeahnah by o_0 December 1, 2003
hey you wanna go to the clay aiken concert? yeah no
yeah no by Tivo December 13, 2004
To be said with a deep southern accent, a phrase of agreement.

A pinch of dip in the bottom lip helps to get an authentic pronunciation.

Along the lines of hell yeah, fuck yeah, let's roll, etc.
Earl: Ey Will you comin to the party tonight?

Will: Yeahbo, I got me some catfish, lookin like its a fish fry kinda night
Yeahbo by xCMx July 11, 2011
A phrase that people now use to start sentences for some goddamn reason.
"Yeah no, I'd love to go commit suicide with you this afternoon. See you at 3!"