Generally speaking, it means that in the afterlife (maybe hundreds of millions of years later), when you meet again, he will kill you. Maybe at that time, the cricket was reincarnated as a human being and you were reincarnated as a human being. He killed you because he hated it. This is a popular saying, so it is easy to understand. It's just a possibility, and the cause and effect are very complicated, depending on other karmic parties.
The causal theory of Buddhism is like this: a quantity for a quantity, good is rewarded with good, and evil with evil. Therefore, we should try not to kill, kill less and add less enemies to future generations.
Every one of us can't avoid killing in life, but we can accumulate more virtues, do more good deeds, be filial to our parents, respect teachers and pay more attention to Buddhism, which can alleviate our karma. Or it is better to return the merits of spiritual practice to the animals we killed.