jump-out
n.— «The young Nebraskans were particularly fascinated and curious about the “jump-outs” that DC police conduct twice each week, in which undercover officers attempt to buy drugs from young people who fit the profile of a drug dealer.» —“Teens Learn Their Rights in an Advanced HIPP Session” by American Friends Service Committee-Middle Atlantic Region MARStar Summer, 2003. (source: Double-Tongued Dictionary)