I hear/read some really good ones sometimes, though I can't always recall some of those zingers that are particularly unique. What prompted this post is a new one I heard today (regarding a big girl's backside):

"That looks like two pigs in a gunny sack!" Now that's really an image, and I'm sure you can imagine what kind of a person that describes.

I'm uncertain as to how archaic that one might be, but it got me wondering, yet again... what other terms do you like to use when describing a fatty?