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1.
a fire hydrant, in new york, esp. lower manhattan and brooklyn, esp. one that's open in the summer for kids to play in
when i got home from work, all the boys on my block threw me in the johnny pump
by candybaby August 05, 2006
 
2.
New York City fire hydrants were first installed in 1808, and by 1817 flip lid-style hydrants began to appear on street corners. The term "johnny pump" is a nickname for fire hydrants that originated in Lower Manhattan and Brooklyn vernacular.
1. I saw a red johny pump next to the road.
2. The firefighters connected their hose to the johnny pump.
by flyoffacliff August 10, 2012