The simplest answer is often the right one. Girlsch is frequently just a misspelling of "girls." The "c" and "h" at the end are easy to add accidentally, especially on a smartphone keyboard. Autocorrect sometimes fails, and people hit send before they notice the error.
This happens with countless words online. "Teh" instead of "the," "definately" instead of "definitely," and "girlsch" instead of "girls" all fall into the same category. Search engines are smart enough to recognize these patterns and usually show results for the intended word anyway.
But if it were only a typo, it probably wouldn't be worth writing an entire article about it. The term has taken on a life of its own in certain spaces, which suggests there's more to the story.
