A Dogg
In Boston, saying something is true by swearing on a DOGG. It's like a sacred promise, and if you lie, you get haunted.
I swear on my DOGG, that pizza was the best I've ever had.
He said on his DOGG that he'd beat me up. I believe him.
She swore on her DOGG that she'd never eat chicken again. She's eating it now.