mackerel snapper - A Catholic who would rather eat a fish than a burger and cal

A Catholic who would rather eat a fish than a burger and calls it a holy habit.

He’s a mackerel snapper. I’ve seen him throw out meat like it’s trash.

My cousin is a mackerel snapper. He eats fish so much, the fish have started to talk to him.

She’s a mackerel snapper. I think she eats fish just to annoy me.