Lesbian slang used to identify other possiblelesbians. If a lesbian is into you but isn’t sure if you like girls, she’ll tell you to have a happy/good/etc. earth day.
1. Earth's birthday (not true, actually October 23.)
2. Day where you help the earth be more clean. Earth Day is celebrated because lots of assholes litter all over the planet. Ways to celebrate Earth Day: (alternate title: ways to not be an asshole)
1. Pick up trash
2. Don't litter
3: Make a compost
4: Fuck yo girl in the pussy
5: Use both sides of the paper
6: Turn off the lights when you fuck yo girl