The American lexicologists added the term of endearment to their tome yesterday, a mere 72 years after its first recorded use in the English language.
Helpfully, and entirely non-inflammatorily, Merriam-Webster's people gave two examples of "sheeple" being used in a sentence. The first was a fairly neutral example of a farmer being rude to his neighbours. The second... well, here it is for your amusement/enragement (delete as appropriate):
Apple's debuted a battery case for the juice-sucking iPhone – an ungainly lumpy case the sheeple will happily shell out $99 for.