Fatbag
Verb - This is when you you have sex with a fat, ugly woman who should, by all rights, be forced to walk around with a bag around her head.

Noun - Fatbagger - A woman who is to be fatbagged.
"Let's go fatbaggin'"
"Man, I was so wasted last night.  Was I fatbaggin' it?"

Fatbagger: "Man, I'm so horny, I could even go for a fatbagger!"