Definitions for yabber
Random House Webster's College Dictionary
yab•ber*ˈyæb ər(n.; v.i.; v.t.)
Ref: jabber .
Origin of yabber:
1870–75; perh. alter., of a word based on ya- speak, talk, in Gabi (Australian Aboriginal language spoken in S Queensland)
To talk, jabber.
Origin: Most likely a modification of the Wuywurung yaba, ("speak"). Dated to 1855.