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
High school students in Alabama share some favorite slang terms. If someone tells you to touch grass, they’re telling you to get a reality check — but the last thing you’d actually want to touch is dog water! Also, the history of the word hangover...
Responding to our conversation about the word chat, meaning “the gravelly residue of mines,” Isabella from Marquette, Michigan, reports that where she lives, in the state’s Upper Peninsula, such runoff is commonly called slag. She uses some made-up...
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.