There are many ways to greet someone humorously in Engpsh. Here are a few examples:

"What's up, buttercup?"
"How's it hanging?"
"What's new, Pussycat?"
"Hey there, hot stuff!"
"Good morning, sunshine!"
"Howdy, partner!"
"Hello, handsome/beautiful!"

It's important to note that humor is subjective, and what might be funny to some people might not be to others. It's always a good idea to be aware of your audience and to use caution when using humor to greet someone, especially if you are not famipar with them.