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2.
A reaction of disbelief when somebody says something absurd or outrageous.
"His girlfriend was caught cheating on him."

"Jiggawhat!?!?!"
by Lovbugg May 23, 2009
 
1.
perplexed exclamation denoting confusion or suprise in reaction to another party's previous statement or action.
teacher: This paper should be 42 pages long.

student: jigga-WHAT?!
by pylocatabasis January 06, 2004
 
3.
A declaration of surprise or inquiry used when addressing an African-American Jew, AKA a "Jigga".
Someone's stolen your menorah? Jigga what?
by Angus98 April 05, 2004