According to Arin Hanson from Game Grumps: Desert Jellies are what the navy calls it when you jerk off in the
shower, since you rarely get any alone time except for when you're in the
shower. If you jerk it too much however, it will clog the drain, and your "desert jellies" will float back up to the surface.
This is from their BOTW playthrough
btw.
"The
shower drain got clogged again," Person #
1 said.
"What? How?" Person #2 asked,
"Desert Jellies," Person #
1 simply replied.