X on a mobile ad

The only thing that is smaller than a quark
Frick, the X on a mobile ad is really really really really really really really small
by Wixkslfjdkfirjeje August 29, 2021
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X on a mobile ad

(noun) The exit button, notoriously small for mobile game advertisements.
“The x on a mobile ad is the smallest known object in the universe.”
by MaybeARealWord March 31, 2021
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