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1.
to express joy in something charming and apparent.
"another episode of strangers with candy, yeah yah!"
by youtica January 24, 2005
 
2.
referring to something/someone very pleasing to the eye
"Look at dat nigga right thurr---I like tha way he doin' dat, yeah-yah!"
by Mymellymel12 March 10, 2004