"At the store", or ATS, refers to a troll named Alex that peruses the Yahoo! Answers forums appearing to be at the store every waking moment of his life. He generally likes to reside in the religion and spirituality section and seems to either anger or make 100s of people happy every day. Many others have been inspired and took on the same exact statement and deviated with it, or made up their own catchphrase that they relentlessly post on any forum or image board they want. Nowadays people use, "I'm at the store", to refer to something boring in a forum or irrelevant.
ATS - Amway Tool Scam, the symbiotic relationship between Amway and the LCKs. When the LCKs asked for more of the Amway profit, Amway turned them down, but then ignored the FACT the upline was TOTALLY misrepresenting the business model by showing the Amway marketing plan, but in reality making most of the profit from their "tools" sold to the downline, yet leaving the ATS out of the presentation.
I thought my Amway upline made most of their profit from Amway, because that's how they show the Amway marketing plan, but then I found out most of their profit comes from the ATS, and most IBOs (distributors) in their group operate at a loss.