L’s n. In the United States, a driver’s license. Editorial Note: In Australia, L’s is widespread and refers to the learner’s “L-plates” and learner’s driving license, precursors to the driver’s permit—one’s P’s—which grants full driving privileges. In the US, the learner’s permit is not issued with special plates. These citations encompass only the American L’s, which refers to the full driver’s license and likely originated independently and more recently. (source: Double-Tongued Dictionary)
Further reading
What’s it like to hike the Pacific Crest Trail all the way from Mexico to Canada? You’ll end up with sore muscles and blisters, and great stories to tell. Along the way, you’ll also pick up some slang, like NoBo, SoBo, Yo-yo and...
The slang phrase someone ate and left no crumbs means the person did something really well. In a previous call, a listener who works in theater noted the use of ate to mean “did something well,” as in they really ate that haircut! This...
Yes “license” is hard to spell.
You realize, I hope, that this probably existed in oral slang before it was ever entered on a keyboard. So ignorance is not the source of this term.