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A large insect that will bite you at the first opportunity. They are a half inch to an inch long, triangular, and carnivorous. When they bite you they take out a chunk of flesh and inject venom. The area around the bite will hurt for around five days.
Sarah got bitten by a horse fly, and found it painful to walk for a week.
horse fly by feesdanse June 1, 2011
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A man who enjoys sex with horses.
That Horse fly over there is fucking that horse in the ass.
Horse Fly by Texyriffic November 15, 2010

Hung like a horse-fly 

Girl 1: Tall, dark, handsome, charming, but hung like a horse-fly.

Girl 2: Bummer.
Hung like a horse-fly by SHLA June 30, 2012

mexican horse fly 

when a man inserts a fly into his urethra before performing sexual acts upon vagina, quickly pulling out and then sticking in the anus when about to ejaculate, releasing the fly into woman's asshole projecting the fly throughout her body and out her mouth. (successful if fly remains alive).
The male prostitute performed the infamous "mexican horse fly" on a very satisfied customer.
mexican horse fly by chives4u5647 November 9, 2010

House Fly Mohawk

When you're banging your chick, take your balls and put one in each of her eye sockets then throw your dick right down the middle of her head.
Ever show your girl the house fly mohawk
House Fly Mohawk by punkisdead83 February 8, 2010
House fly, Where someone acts as a fly and vomits on their partners genitalia and rubs it over them before eating it like a fly.
Girl number 1: I used the house fly on my boyfriend last night.
Girl number 2: interesting, I used the Polynesian shake with mine.

flying horse 

Another term used used for anal sex
'Fancy a quickie Dierdre?'
'Sorry Ken, I'm up on blocks, it'll have to be the flying horse'.
flying horse by Yorkshire puddin September 2, 2016