Slappin' Grandma

The other night we were out and I tried someone's homemade salsa. It was really, really good. I said, "Man, this salsa is great!"

The guy sitting next to me replied, "Yup, it'll really make you want to slap your Grandma!"

"What?"

"You know. It's a saying. It means it's really good."

At this point, I was laughing so hard I thought I was going to fall off my chair. He looked at me with a puzzled-what-did-I-say-that-was-so-funny sort of expression on his face. "You guys don't have sayings like that up north? Like, that will make you want to kick your dog? Kick a can? "

"Uh... no."