The combination of someones attitude and how "Jacked" that person is.
A person with large ammounts of Jackittude is usualy seen in a gym or at your moms house.
Not to be confused with "Jackitude" (One T).
Guy: Hulk Hogan had much more Jackittude in the 80s.
Guy 2: Agreed, that guy was fucking crazy!
Where one of your mates or work collegues has a "Jack Bastard Attitude", or where they act like a jack bastard continuously with the same attitude towards you.