a cord or, strip, or cylinder of loosely woven material through which a liquid, e.g. paraffin, oil, or melted wax, is drawn by capillary action to the top for burning in a candle, lamp, oil stove, etc
dip one's wick
coarse slang said of a man: to have sexual intercourse
get on somebody's wick
Brit, informal to annoy or irritate somebody
[Old English wēoce]