Honestly the gardening line feels too specific to be a joke she made up on the spot. If she was trying to cover a mistake, she'd probably just say "oops I meant my back." The fact she described it as her back's face to the sun makes me lean toward lily's idea, that it's a regional or just a very literal way of talking. Some people just have their own personal dictionary.

Those shortcuts saved me when I was laying out a huge poster with tons of repeated elements!

Guess my 6.0 is just jealous of the attention.