n. a stealth bogey that can appear on the top lip of an unwitting person, often leading to embarrassing situations
v. to be o'neilled, the act of having an o'neill (see above) on one's top lip
*girl offers guy a tissue*
guy: "wtf was that about?"
guy's mates: "you've been o'neilled."
© 1999-2015 Urban Dictionary ®
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