1. When two obese people engage in sexual congress(MORE COMMONLY KNOWN AS SEXUAL INTERCOURSE)

2. When one wants sexual intercourse with an obese man or woman.
Fred: Man i want a fatty fuck right now
James: Shut up i am already that 24/7
by Ranicedo June 29, 2006
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Using a lubricated fold of fat to stimulate a penis. This act can result in climax or simply as foreplay. This act is much like tittie fucking but is using one or more folds of fat instead of breasts.
"That chick had so many rolls I fattie fucked her all night long and still didn't run out of places to put it."
by Rob_SD January 23, 2008
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