When someone's indoor speaking volume is comparable to A NORMAL PERSON'S SHOUTING similar to resting bitchface
Guy 1: HEY! HOW'S IT GOING?
Guy 2: Chill it with that resting bullhorn, we're in a library.
Guy 1: SORRY , IT'S JUST WHO I AM
The Mexican Bullhorn is a greeting that originated deep in ancient Aztec culture. A host would tuck in his shirt just before a fart, pass gas, and place his face down his collar to inhale the vapors. Next, the host looks his victim in the eyes and exhales the flatulence into his face.
Alex smiled as Scott approached. He subtly brought his shirt collar up above his face and took a deep breath. When the unsuspecting prey was within an arms reach Alex exhaled full force--the Mexican Bullhorn had rendered Scott (or your FBF) unconscious.
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When a female queefs in anothers (male or females) face which ultimately wakes them up.
John was so drunk that even Mary's Russian Bullhorn didn't wake him.
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A male erection that is bigger and harder than normal.
Dude when she stuck her hand down my pants it gave me a full blown raging bullhorn.
When a person constantly talks loud
That woman over there is so loud she has Bullhornism