Pic Cione 

From the Italian word meaning “Pigeon Slaughter”. This is slang for somebody who proports to be your wingman and then sabotages you by shooting you in the back.

I went over the hill and that my own corporal shot me in the back, damn Pic Cione...now I am bleeding to death...

Pic Cione by sailorman September 8, 2013

unwarranted piccione 

The act of having an over-inflated sense of one's ability despite no evidence supporting this belief

Gibbo: 'I swear that if I stayed off the piss I could have run the 100m at the Commonwealth Games'

Everyone: 'Gibbo that's unwarranted piccione and you fucking know it'

unwarranted piccione by People's Champ 37 September 26, 2017

Piccione 

A rabid pigeon commonly found in Italy or the streets of New York City.

That bastard Piccione just hit my window.

Piccione by pigeonshiter November 10, 2010