Noun
(chiefly attributive) A bachelor party or bachelorette party to which both men and women are invited.
(rhyming slang) A bill (as for a restaurant meal).
(rhyming slang) A till (cash register).
(rhyming slang) A hill.
(rhyming slang) A pill, especially the contraceptive pill.
Source: en.wiktionary.orgJack and Jill ran up the hill, both for a little fun. Jack's plan was deception while Jill sought affection. And Jack wouldn't quit till he won. Laurie Faria Stolarz
The practical consideration was that I had settled on calling the children Jack and Jill, mostly because that was another folkloric pairing (like Hansel and Gretel) that kids would recognize. Source: Internet
This was followed by appearances in two Vitaphone shorts the following year: A Holiday in Storyland (featuring Garland's first on-screen solo) and The Wedding of Jack and Jill. Source: Internet
Since no-one needs a constitutional mandate to clean-up; every Jack and Jill can and should clean their premises once, twice or even three times a day. Source: Internet
The event was hosted by the Chicago chapter of Jack and Jill of America, an organization of mothers dedicated to nurturing future African American leaders. Source: Internet
“The fundraising for Jack and Jill started off as something the juvenile club was doing, then the senior club got involved and then the veteran players, so now it’s across all the generations within the club. Source: Internet