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A man/and or woman who is so fat they are constantly constipated.
Your mom is such a fatcrap she's been takin' the same dump for 25 years.
fatcrap by phoenixrayne13 November 25, 2006

fatcrack 

Technically any fold of fat of a morbidly obese person, but in common usage one that harbors foul-smelling excretions. These can be simple body odor, areas that were too hard to reach during showering, or areas that have become fouled through elimination, the impossibility of spreading the cheeks, or constrained by the shape of a toilet seat (the latter two causing a "muddy fatcrack"). The word can also be used to describe odors caused by a fatcrack - in this case 'fatcrack' is most often experienced when the fat person moves, releasing a bolus of odor, or 'fatcrack'.
1. "Damn, that lady on the bus had some serious fatcrack going on."

2. "What's that smell? - Oh, that's Ruth, she's got a muddy fatcrack".
fatcrack by ClimbingTheLog November 28, 2006
An interchangable spray tip that can spray really big!!
Fatcaps can fit on almost any can.
FATCAPS by DigDug March 8, 2004

Fatcrastonating 

Eating in order to delay starting your work
I was fatcrastonating so bad this weekend- I had three snacks before I started my homework
Fatcrastonating by JakeCVD September 4, 2016

fat crap 

dude, i took a fat crap last night and it clogged the toilet
fat crap by savethedinos February 13, 2021

fat crap 

Somebody who is annoying or has done something wrong
fat crap by Craig___2006 June 29, 2006