Doing a Joe Hawley describes One of Two things:
1.
Posting a cryptic and worrying picture or caption on
social media, most likely pertaining to an event that happened in your life, and when people ask and get concerned,
taking it down minutes after.
2.
Reversing a song, words, or phrase backwards, making it hard to hear.
This action derives from the guitarist, Joe Hawley, From the band Tally Hall.
See Hawley-esque for more details.