your luck is in

your luck's in

Someone is interested in you as a prospective sexual partner. Your luck's in, Jimmy. She's been asking around for you.
Farlex Dictionary of Idioms.

your luck is in (or out)

you are fortunate (or unfortunate) on a particular occasion.
See also: luck
Farlex Partner Idioms Dictionary
See also:
  • your luck's in
  • run someone out of town
  • save someone's skin
  • on one's
  • on someone's
  • do someone or something justice
  • golden shower
  • let something drop
  • out of one's
  • (I've) got to go