Because you didn't say where you saw Keep hit, I have two guesses:
1. This is what I know and I have seen it many times on T-shirts and baseball caps. Keep hit is a language template for printing text on a T-shirt. In fact, you can print them anywhere you want: on mugs, on the back of mobile phones, on baseball caps, on the cover of notebooks and on pencil cases. Because there are always the words keep and hit, it becomes the expression of Keep hit. Because most of them are boring language, you don't have to care about the meaning.
They generally adopt the mode of keeping calm and typing (the person who wants to print can choose+one or more words). For example:
Stay calm and smoke a pipe (the most choice)
Stay calm and hit hard.
Stay calm and crack down on the bill
Stay calm and hit Dana.
Stay calm, 88 miles an hour.
Stay calm and hit a home run like the boss.
Stay calm and go to the gym.
Stay calm and hit people.
Stay calm and hit your friends with bricks.
Wait, wait, wait You can create your own endless works. Do you want to try!
Let me tell you something first (some boring, some vulgar):
Stay calm and hit the lamppost (boring! )
Stay calm and click the mouse.
Stay calm and hit the nail on the head (boring! )
Keep calm and beat the cock (vulgar! )
Stay calm and shit (vulgar! )
Keep calm and drill a manhole (boring! )
Larger variants can also be produced, such as:
Keep your dreams alive. Press the pause button. (Does it make sense? How significant is it? )
Keep your pants & it hits it off (vulgar! )
You can use various colors and fonts and add some design concepts to make the printing more beautiful and personalized.
You can also use any word boldly on the premise of keeping the words kept and hitting. For example:
Stay calm and let the shit hit the fan (boring language! )
Keep calm and spank her (no fun! )
Of course, no one says that you have to keep typing, but westerners can always stick to some basic rules (such as keeping typing), even if they do something boring!
2. Or the spelling mistake of "keep healthy".