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To perform a Jack Yonce is to stand in the middle of a packed auditorium during ANY and ALL intermissions of a concert for the sole purpose of being seen. This usually happens with the arms folded and that person talking to another person Jack Yoncing, or looking around acting like they are looking for someone specific, when in all reality they are waiting for someone to notice them and wave first.
"You sure do get to see a lot of band directors you dont normally see during the year at All-State Band"

"Yeah, look over there, Tim and Clay are Jack Yoncing like a pro!"
by non-Jack Yoncer April 14, 2012
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