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1.
when one passes a reflective surface and can't resist the urge to "check themselves out"
did you see that guy pass that window? he totally just did a self checkout
by baby mongoose December 14, 2009
 
2.
When someone credit card swipes or scratches their ass and then smells it.
The girl on the subway platfrom this morning chose the self check-out. She scatched her ass, then sniffed it. we made eye contact and she the she dove into her shame hole.
by slobby1 October 26, 2011