Jack and Jill

noun5

1. •
   [before a noun] A bachelor party or bachelorette party to which both men and women are invited.

   • Men usually aren't as enthusiastic about shower games and the like as women, so “Jack and Jills” have a tendency to turn into regular parties. — 2001
2. •
   (slang) A pill, especially the contraceptive pill.
3. •
   (slang) A bill (as for a restaurant meal).
4. •
   (slang) A hill.
5. •
   (slang) A till (cash register).