The still-warm, semi-digested remnants of the week-old chili mac that a grizzled, old wino puked up outside the doorway to the city rescue mission.
"Watch it! Man, Pedro, you almost stepped in that pool of barfaroni!"
Wino: "Hey, GIMME DIME!!!"
something or someone that makes you so sick to the point of barfing
That meatloaf is so barfaroni!