Any tips?

So my 15 month old has started biting and thinking it’s funny. He’s had phases in the past where he has bit when he was tired or really excited or mad or any other emotion he didn’t really know how to show. But lately it’s been more of something that he thinks is funny. Or he does it when I’m eating to try to get me to give him my food even if he’s just eaten or has a snack of his own. He really only bites me, sometimes his dad but no one else yet. In the past we could just pull him off us and look at him and tell him no and he would get sad but he seemed to understand, now he just giggles. He knows what no means but I think he’s just trying to see where the line is. Any discipline tips that have worked for you to get a young toddler to stop doing something bad?

And it’s not because he’s teething, he actually does it less when teething because his mouth hurts too much.