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1.
Obelix says this to Asterix in the book "Asterix and the Laurel Wreath" by René Goscinny (stories) and Albert Uderzo (illustrations).

It is a louder and more forceful form of "exactly".
"We should get some wild boar."
"Nah... I'm too hungry."
"Zigackly!"
by Evilaark December 10, 2007
 
2.
more exactly than exactly , a confirmation or response.
"Now I know what you mean" ! (response )zigackly !
by Jimmy Cinders August 23, 2008