A trope of formulaic Western fiction: White character who, with relatively little effort, masters a skill most closely associated with the culture of another ethnic group. This skill is commonly some sort of martial art, and the White character often becomes more skilled than both his ethnic mentor and his ethnic opponent.
"Wow, look at Mighty Whitey becoming a Kung Fu master in the span of a mere sixty-second montage!"
"Amazing! Now he can go save the girl from that Evil Chinese Guy and then single-handedly beat the Other Team at the Kung Fu tournament!"
by So I says to Mabel, I says December 3, 2015
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A white person or group throwing their weight around, or abusing their authority. All the while oblivious to the implications of it when their bully group is all white and they're making decisions that adversely affect minorities.

N.B.: The group doesn't technically have to be all white, but the few minorities around them should be of the Clarence Thomas variety where they say nothing in order to protect their own position.
The Mighty Whitey and his friends didn't think twice before deciding to cut the budget for Black History month activities.
by brown girl in the ring February 22, 2011
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The group of people who, for the last few hundred years, has brought civilization, technology, rights, and female equality to the rest of the ignorant savages living on Earth, most of whom never even discovered the wheel, or metallurgy, or written language, and now gets shit on for it by those same savages.
"Uh oh, those filthy rag heads over there are making a game of gang-raping women; better send in Mighty Whitey to stop them!"
by Cunning_Linguist69 January 28, 2021
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A slang term, at least in Humboldt County, California, for oxycontins.
Hey yo! Can you spare some mighty whiteys for a bro?
by Boogercat March 2, 2018
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The white castle hamburger, aka slider. There is a serious imbalance between the onion:meat ratio.
In this burger, there are too many onions and not enough meat.
by Zach G. January 17, 2004
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A hamburger(?) from White Castle (flavor is enhanced by an evening of drinking prior to the meal). See slider.
I'm about to quickly ingest 10 Mighty Whitey One-bities! Burrrrrp!
by Dave Thomas August 26, 2003
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