420 refers to marijuana smoking, so '420 friendly' means that the person posting the profile either smokes pot, or, is open to dating someone that uses marijuana.
Originally it was used as code amongst marijuana smokers.
I wasn't going to be the one to bring it up, but...
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Plentyoffish dating forums are a place to meet singles and get dating advice or share dating experiences etc.
Hopefully you will all have fun meeting singles and try out this online dating thing...
However relocation might be required in some cases due to issues such as environmental protection.
The growing size of the unofficial event at UC Santa Cruz caused the Vice Chancellor of Student Affairs to send an e-mail to parents in 2009 stating: "The growth in scale of this activity has become a concern for both the university and surrounding community." Signs bearing the number "420" have been frequently stolen.
When someone you're dating, or, someone you're talking to via an online dating site, mentions that they're "420 friendly," what do you say?