In my opinion “loving slap” is not categorically impossible but sounds odd. “love slap” also sounds strange. There is no single obvious correct answer. “playful slap” would work. I agree that “on the face” is more natural.
These are OK except that “Everyday” should be “Every day”. The original sentence was wrong in this respect too. Again, there is no obvious single correct answer. It is not even very obvious to me that “footing” is supposed to suggest “walking”.
Actually I have been led to Urban Dictionary by Google for many times. Little did I know how the content in the site was built up.
Thank you for the information and directing me to COCA. Its user interface is a little bit more complicated, but I’ll definitely give it a try.
Right, Urban Dictionary can sometimes be useful for slang terms that are too new or too obscure to be listed in regular dictionaries, but it needs to be treated with great caution as there is no proper editorial control and it contains a lot of garbage and made-up nonsense. It definitely should not be used as a regular dictionary.