jabroni, n. — Green’s Dictionary of Slang

jabroni n.

[Ital. sl. gabrone, a cuckold]

(US campus) a failure; also attrib.

2004		Urban Dict. 27 May 🌐 Jabroni A loser, poser, lame-ass. One who talks the talk, but could never walk the walk.
2014		E. McNamara ‘Authenti Cityin ThugLit Sept. [ebook] ‘Forget that [...] jabroni chef’.
2016		C. Eble UNC-CH Campus Sl. Spring 2016 5: JABRONI — loser.
2021		Twitter 27 Feb. 🌐 RIGHT FROM THE START OF THE DAY DONT BE A JABRONI.