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Belly Puffer 

A belly puffer is a girl who is so thin that when you're inside of her, you can see your penis poking her abdomen.
Do you see her ribs? I bet she's definitely a belly puffer.
Belly Puffer by Silver-Fox January 4, 2012

Run the puffing Billy 

When a group of senior men over the age of 70 run a train on your girl. The term is from how one of the oldest steam trains is called The Puffing Billy, and how some of those 80 year old weenies let out a puff of air instead of a cumshot upon finishing
My ex gf said she was going to the retirement home to volunteer, but it turns out she was there to let a bunch of old heads run the puffing Billy on her