The story
From pussy + -gate, in reference to Trump's remark that "when you're a star, they [women] let you do it, you can do anything... grab them by the pussy".
Etymology from Wiktionary, CC BY-SA 4.0.
Pussygate
Today it means: A controversy in 2016 regarding a lewd recorded conversation between politician Donald Trump and Billy Bush on the subject of women. Full definition →