What does it mean when a guy friend slaps your ass?

skylinedefined

I had a weird day with my friend. I assumed it was just hanging out as friends but my best friends said it was a date. Anyways we went out for lunch (he paid), then we went to play tennis and we chilled at the pool and drank. He called his friend and we were heading to the gas station to get some more beers and my friend came out of no where and slapped my ass as hard as he could. And later on he apologized and rubbed my butt lol. But there were some weird comments made by him which seemed like he was flirting but I really have no idea. Was he hitting on me? I've known him for two years

What does it mean when a guy friend slaps your ass?
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