Chinese net-slang.
The act of consuming a dramatic story typically involving celebrities as it develops WITHOUT GETTING INVOLVED IN THE CONVERSATION, usually via social media posts. These stories are juicy, sweet, and lacking substance, much like a watermelon.
Synonym: buying soya sauce - to indicate one is not involved in the drama currently unfolding.
eg. The crowds of watermelon eaters eagerly wait for more details to be dug up as the story develops.
A: Did you see that post too lol, man I really wanna say something.
B: Don't engage if you don't wanna get trolled, just eat your watermelon and enjoy.
So many stories this year had us eating watermelon non-stop!