These days there are all sorts of slang terms and things that people use on these apps and sites, and this is certainly one of the more common ones. You will ultimately need to ask the person if they themselves smoke, though it is usually implied that they do if they have this in their profile.
While this may seem "What does 420 friendly mean sexually" bit odd or unnecessary to you, there are legitimate reasons that you might want to be aware of.
Smoking marijuana is still against the law in a vast majority of places in the U. The person usually just wants to be upfront about their behaviour instead of letting it be a surprise later on, which is actually pretty considerate when you think about it.
The fact is that not everyone enjoys the feeling of being high, and many people choose not to smoke marijuana for whatever reason. If a person on a dating site or app likes to smoke, they want to make sure that other people using the same platform know about it from the very beginning.
If you have ever smelled marijuana before, you know how strong it is. If the person looks high to you, they probably are. It is pretty obvious when someone is high—they have bloodshot eyes and tend to look a bit distant.
You never want to just assume that a person is okay with marijuana though, so directly asking them is always the best option. You can usually smell marijuana on a person if they have been smoking it recently, so you will need to keep that in mind as well. Take a look at pictures of the person on the dating site as well as social media to see if there are any clues that they might enjoy smoking marijuana.
Not everyone posts pictures of themselves with bongs and joints, but it may help you get the answer you need if you are too shy to straight up ask them. While a lot of people who smoke or are okay with marijuana do put this somewhere in their profile, it is not always the case. You should be able to get a pretty good idea about how okay a person is with marijuana just by to them for a bit.
What does 420 friendly mean sexually they seem pretty buttoned down and uptight or more mellow and chill? You can always ask the person if they smoke, but never just assume. The last thing you want to do is just assume you know the person smokes, because they might not be the case at all. There are many different reasons why people choose to put this in their profile, but there is not a single meaning behind it.