HK
HK has 2 meanings
Hugs and kisses
HK is an acronym that stands for "hugs" and "kisses," which is used to convey affection. It is often used when saying goodbye to represent the action of actually giving a hug and kiss.
You'll most likely see HK in text messages or online where character space is at a premium. You might also see H&K, which is the same as HK but with one more character.
Example
Luv ya lots! HK!
Baseball Slang Quiz: Can you bat 1.000?
Fans of Hello Kitty sometimes shorten the cute, anthropomorphized cat's name to HK. For example, you might see Hello Kitty referred to as HK in forum and social media posts discussing HK products.
What is Hello Kitty?
Hello Kitty is a fictional character who originated in Japan. She is a white cat who dresses in children's clothes and wears a pink bow on her head.
While Hello Kitty was created in 1974, she got big in the 1990s and 2000s, appearing on lunchboxes, jewelry, stationery, and nearly every other type of product you can think of. Now, there are Hello Kitty TV shows, comics, coffee shops, and even theme parks, and HK remains popular among girls (and some others) of all ages.