To do, copy, and bash everything an ex-girlfriend of your boyfriend did/does like Jessica Simpson did to Carrie Underwood.
Person 1: Oh my gosh, she's such a copy cat!
Person 2: I know! She's totally Jessica Simpson-ing it!

Alternative: She's totally J.S.ing it!
by sjghazosejtog August 25, 2008
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Jessica Simpson is a pop star singer
a hot girl
but one really stupid dumb blond!
proof that she is dumber than u!
Jessica SSimpson is the #1 dumb blond ever! literally!
by pia March 6, 2004
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the hottest girl ever i mean shes HOT the Dukes of Hazzard was th BEST movie ever p.s. nick is a hater
hey guys she turned down having dinner with bush she has to have some sense
jessica simpson is sooooo hot i wi sh i looked like her -paris hilton
by M. Ghandi May 5, 2006
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she is pretty, has a kind of nice voice, and acts dumb, but she has no ass, she fakes one by wearing butt pads
jessica simpson in the video these boots are made for walkin
by Sarah La'Shay December 29, 2005
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The ailment of being very, very, dumb. Charecterised by random outbursts of an obsurd nature. Some signs may include but are not limited to the following

"Is Peanut Butter Dairy?"
"I always that an autobiography had to do with cars"
"Omg, Earthquake (Picks up cellphone)"
Omg, that gurl tottaly has jessica simpson syndrome, Poor michael.
by Michael F. February 1, 2005
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Losing your fiance (or spouse in her case), gaining 40 pounds and not showering. Used in the television show Glee.
Pull a Jessica Simpson :

Finn: Sometimes I wish I could be more like coach. He pulled a Jessica Simpson - you know, lost his fiance, gained 40 pounds and stopped showering - and everyone acts like it's totally normal.
by Gleek1993 May 18, 2010
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A girl, either ugly, fat, or unpopular, that believes she is a splitting image of Jessica Simpson. Most usually, this girl has a very warped mind about the world, women in general, and mainly herself. She is led to believe due to this disorder that since she is so much like Jessica Simpson, she should be treated as such. If in any case you fail to treat her this way, with all her power, she will attempt to make you conform.
Many believe Jessica Simpson disorder to be related with heavy MTV viewing, cheese intake, and a long/drawn-out menstrual cycle, lasting an entire year. The only known cure is immediate psychiatric treatment. Removal from MTV/Cheese will combat some of the symptoms, but relapse is common.
Currently, 1% of the female population has this disorder, with 10% of those afflicted residing in Wisconsin.
"Dude, just fucking dump Heather already, nobody likes her. She is manipulating you with her Jessica Simpson Disorder."
"I thought the tv remote had a lot cheese powder on it."
"You better wash those hands, she'll lick 'em clean to the bone."
by Biff Justice November 2, 2005
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