Someone that looks like Tarzan and fights like Jane.
Someone who sets themselves up to be embarassed.
As in bring it on you look like Tarzan and fight like Jane Jabroni, come say it to my face so I can put my fist through yours, and then wipe my ass with it, bitch.
As in someone asking if another person if they they pulled their pants down back there, and to the Jabroni you say, no I pulled your wife's pants back down there, and then I went down there.
....or, someone saying to you "You and I have nothing in common" to which you respond to the Jabroni by saying "We both have something in common because we've both had sex with your wife".