Would you be down to X = would you be okay with doing X Would you be down to have pizza for dinner? = Would you be okay with having pizza for dinner? It is very casual and 'cool' English... -------- Saving yourself for marriage = not having sex until after marriage --------- In the case of "Would you be down to like pinky promise to save ourselves for marriage," "like" is just an unnecessary word some people add when speaking. --------- Basically, "Would you be down to like pinky promise to save ourselves for marriage?" = Would you be okay with promising that we will not have sex until marriage?"

"Would you be down" is a colloquial phrase for "Are you interested in..." or "Would you like to do...". This is mainly used in very casual settings between two friends that know each other well. "save ourselves for marriage" means, I can only assume, to abstain from sex and to wait until marriage. However, I could be wrong here. Depending on the context, it might mean to simply remain faithful to each other in a relationship. Bonus: "Like" is a filler word that isn't grammatically correct here, in other words, you can omit it and the sentence still survives. (In Elementary School I would write "like" in the middle of my sentences, and my teachers would always correct my mistakes lol)

"Would you be down to like..." means 'Would you be willing to/do you want to...'. It's just a more colloquial or more common way of saying 'Do you want to...' in spoken English. "Save ourselves for marriage" means that of one the two people in this case wants to not have sex before marriage. Basically saving their virginity until after they've been married.

Would you be down to X = would you be okay with doing X Would you be down to have pizza for dinner? = Would you be okay with having pizza for dinner? It is very casual and 'cool' English... -------- Saving yourself for marriage = not having sex until after marriage --------- In the case of "Would you be down to like pinky promise to save ourselves for marriage," "like" is just an unnecessary word some people add when speaking. --------- Basically, "Would you be down to like pinky promise to save ourselves for marriage?" = Would you be okay with promising that we will not have sex until marriage?"

"Down to " - informal - "be willing to" (often this is "down for"). "Like" is being used as a filler word here, with no meaning. "Save ourselves for marriage" means "not have sex until we are married." https://www.urbandictionary.com/define.php?term=down https://www.quora.com/Why-do-Im-up-for-it-and-Im-down-for-it-mean-the-same-thing https://www.thoughtco.com/what-is-a-filler-word-1690859