when someone says something wrong, especially after having argued with you insisting that they're right, when proven wrong in front of everyone, the person who proved them wrong uses this phrase and proceeds to swipe or smack their hand across the back of the offender's neck. It should be done in a way to be as publicly humiliating as possible. Note: it is not necessary to actually physically hurt the offender.
"Yo, I swear that New York City is the capital of New York."
"Actually, it's Albany, so can I gets mines?"