I think tk, what do you mean?

When a boy sends you tk, he actually means to express to you.

I'm sure you are waiting for him somewhere, and then you get impatient, so you send a message to urge him to hurry up. You are tired of waiting, so he may also be in a hurry to get to your side. When he walks at a brisk pace, when he sees the short message you sent to urge him to hurry up, he wants to tell me that I have already left very fast. I didn't think it was a mistake. Here.