Someone who goes to Trader Joe's excessively and/or someone who exclusively uses all of their many fine food products. A Trader Joe's whore.
They are such Trader JoeHoes. They'll eat anything and everything in that store. Last week they went to TJ's twice because they had to get more "Yogurt Dill Papadums" and "Tofutti Hooray Frozen Sugar Free Soy Bars"!