When:
Lookups spiked on June 25 and 26, 2015.
Why:
In two successive days of landmark rulings, the Supreme Court announced that the federal government could provide nationwide tax subsidies for health care and that same-sex couples can marry in every state.
SCOTUS is an abbreviation for "the Supreme Court of the United States" and is frequently used in headlines. It's also used as a noun (as in "SCOTUS should review this case"). It was initially used as an abbreviation for use in telegraph messages in the late 1800s. Similar acronyms have subsequently become popular: POTUS ("President of the United States") and FLOTUS ("First Lady of the United States").
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Merriam-Webster unabridged