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This is an addition to the previous definition, which is half right. "Gabagool" is slang for "capicola." It is not a mispronunciation, but is instead in Napolitan dialect, which is what the Sopranos and many Italian-Americans use.
The rule in this dialect is to chop off ending vowels and to voice unvoiced consonants.

Ricotta-"rigot"
Manicotti-"manigot"
by Lisa Moscatiello July 11, 2005
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2
A spicy Italian sausage. Tony wants it but can't have it.
Tony: Who ate all the gabagool?
Wife: No more gabagool for you, the doctor said it's bad for you.
Tony: I don't give a f...!!!
by Pallomember May 21, 2015
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3
Capicola Ham.
"My wife sends me here to shop because they got good gabagool."
by S.J. September 02, 2003
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4
The Sicilian pronunciation for the spicy deli ham "Capicola".
"Do you want provologne on your gobagool sandwich?"
by Jeff January 31, 2005
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5
The soup Michael Scott orders when he has a business lunch with the so-called mafia.
“And for you sir”
“I will have the gabagool.”
“The..what?”
“The gabagool.”
“I- I don’t really know what this is..”
“You know..the gabagool”
by univ3rsal April 20, 2020
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6
The americanized version of the Italian word "Capicola" made popular by Tony Soprano and other ignorant 2nd & 3rd generation Italo-Americans who have forgotten how to speak italian properly.
Capicola is a spicy deli meat similar to ham or salami.
"Let's have a gabagool sandwich after we wack Big Pussy."
by Stallion April 18, 2004
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