In the American cuckold and swinging communities, a black male who has sex with the female half of a white male/female couple, while the white male watches.

Some cuckoldry fetishists extend the fantasy to one where the black male impregnates the white female and the white male is forced to pay and care for the baby. Some fetishists are into "cleanup duties" where the cuckold is made to eat the semen off the black male or the white female.
I posted an ad on Craigslist for a black bull to come and fuck my hot wife.
by FireMe Hotly August 17, 2009
A Black Bull is a Strong, Muscular, Sexually-Voracious black man who enjoys dominating any thick, married, white women with his grotesquely long, fat, and veiny black dick.

A Black Bull's entire existence is to black breed these married white women with his potent seed, while her white husband watches his wife get impregnated by the savage Black Bull.

Because a Black Bull has a very big dick and has large, full, and heavy black balls, it only takes one time to successfully breed a thick, married, white woman.
Ethan watched Tyronne, his wife's Black Bull, impregnate her with yet another black baby for him to raise.
by BlackBrute August 21, 2020
Malt Liquor for the mature alcoholic. With an alcohol content of 10% and a low, low price that appeals to high-school students and natives alike, two 40s of this nectar of the gods can make you the life of the party, or send you to the emergency room. Brewed by Pabst in the US of A but found in Canada.
Black Bull has alot of potential to be one of the best in Canada. The fact that it weighs in at 10% makes it a true heavyweight. All in all when you first smell this badboy you want to cringe, but as soon as you start to swill you find your self quite satisfied. -40ozmaltliquor.com
by HKIC April 16, 2004
A cocktail, served in pitchers, that consists of a can of Red Bull and five shots of black vodka.
It is reputed to have the same effect as speed and hence drunk in large quantities by pussy-ass 16 year old wannabes. In reality it just makes them very drunk and turns their puke green.
BLACK vodka + red BULL = BLACK BULL
genius!
by intheflesh December 9, 2005
Day where SnowBunny goes out of her way to ensure she gives her Black Bull a nice relieving Blowjob, or Black Bull can show his SnowBunny and demand it.
If she knows first…

SnowBunny to Black Bull: “You know what today is right” (dropping to knees as unbuttoning his pants)

Black Bull: “No, but I think I’m going to enjoy it”

SnowBunny: (taking his in and out of mouth) “I’m sure you will because it is August 4th, National Blow Your Black Bull Day, so here I am”

Or if he knows first…

Black Bull to SnowBunny: “You know what today is” (unbuttoning pants)

SnowBunny to Black Bull: “Not exactly no, what is it”

Black Bull to SnowBunny: (pulling her head onto his dick) “It is August 4th, National Blow Your Black Bull Day, so don’t miss a drop”
by SnowBunnyQueen July 31, 2022
Day where SnowBunny goes out of her way to ensure she gives her Black Bull a nice relieving Blowjob, or Black Bull can show his SnowBunny and demand it.
If she knows first…

SnowBunny to Black Bull: “You know what today is right” (dropping to knees as unbuttoning his pants)

Black Bull: “No, but I think I’m going to enjoy it”

SnowBunny: (taking his in and out of mouth) “I’m sure you will because it is August 4th, National Blow Your Black Bull Day, so here I am”

Or if he knows first…

Black Bull to SnowBunny: “You know what today is” (unbuttoning pants)

SnowBunny to Black Bull: “Not exactly no, what is it”

Black Bull to SnowBunny: (pulling her head onto his dick) “It is August 4th, National Blow Your Black Bull Day, so don’t miss a drop”
by SnowBunnyQueen July 31, 2022