Txtspk for "Will Let You Know"
Person#1: "we goin out 2nite?"
Person#2: "ugh wlyk"
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An errand, most often performed at night, whose sole purpose is to pick up booze and/or cigarettes; hence, loading up on things commonly known as "vices".
Dude, if we are staying in tonight, then I have to make a vice run.