A level of inebriation so extreme that one loses all attachment to reality and begins to genuinely believe that he is Kakarot (Goku) from Dragonball Z. Similarly all friends present are believed to be other characters from the Dragonball Z universe.
Cop 1: what does the breathalyzer say about his blood alcohol level?
Cop 2: IT'S OVER 9,000!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Cop 1: HE'S KAKAROT DRUNK!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Son Goku's Saiyan name. The name is a pun on carrot, as is the name of his home planet Vegeta, (vegetable), if you notice, most saiyan names are puns on vegetables. Raditz = Radish, and so on.
Vegeta only refers to Son Goku as Kakarot because (or it as at least implied), that he doesn't recognize Goku has an earthling, because he was born saiyan, and he believes he should take pride in that fact, however Goku thinks otherwise, he wants nothing to do with the saiyans due to their violent and merciless nature, and prides himself on being raised an earthling.
Kakarotto, also known as "Goku" in the anime Dragonball Z, created by Akira Toriyama. 'Kakarot' is Goku's realname on his home planet of Vegeta-sei, before he came to earth and was given his new name. The'to' is added for formality. The only one who calls him by his Saiya-jin name is Vegeta.
Goku's Saiyan name, the main protagonist in the dragonball anime. He is referred to as Kakarot by other Saiyans like Vegeta due to their saiyan heritage. However, all of his friends on earth call him Goku.
Kakarrot (or Kakarotto) are alternate spellings of his name, and all three of them can be used interchangeably. Vegeta is his arch rival, and strives to become stronger him at every turn.
Kakarrot is a fierce warrior, after he receives proper mental and physical training, he has virtually unlimited potential and is the strongest fighter in the universe.