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3.
A quick trip to the nearest Walmart often out of idle boredom, whether you buy anything or just play with the "try me" buttons on kid's toys. A Walmart run often involves two or more people, always on the spur of the moment, and is generally late at night or early in the morning.
"I'm tired of playing Halo 3 for my kick-ass Xbox 360, let's go on a Walmart run!"

"Hey, it's only 2 in the morning, we still have 4 hours before the sun rises, let's go on a Walmart run!"

" 'Two minors were kicked out of Walmart last night after causing a ruckus on a late-night Walmart run.' "
by Ben Deivert December 28, 2007
 
1.
To run or drive to the Nearest Walmart late at night for some bedtime snacks.
"Dude its 1:30 in the morning and im hungry.
Lets go for a walmart run"
by Marino K December 05, 2006
 
2.
A late night run to Wal-Mart where you take Hannah Montana dolls from the toy section into one of the camping tent displays and jerk off in her hair.
After I saw the new Miley Cyrus music video, I had to go for a Walmart Run.
by Calcobrena October 12, 2014