"ð" in slang is typically used by itself as a reply and usually refers to the user being extremely slutty and horny. "ð" and "ð" used together is usually a very gay black femboy men that also are very slutty and horny. Women that use "ð" and "ð" together are all ladyboys with both a vagina and 19 inches of rock hard venom. Use caution as it can very easily be misunderstood that you want to fuck uncontrollably, so do not use it as a joke.
friend: yo wanna get on Hollow Knight Silksong?
you: ðð
friend: alright oil up be there in 5
"ð" Crying emoji in slang would mean here you really, really, want to fuck your friend.