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enough to choke a horse 

a lot of something or to a high degree
His dog was big enough to choke a horse.

Have to see a man about a horse

From old spagetthi westerns, where one would "see a man about a horse" when his needs for urinating became to high.

to risk eating the horse's sperm 

When you have 50/50 odds that something could turn out just fine or be really, really awful, and you go on doing it anyway, you are taking a risk that you could be "eating the horse's sperm". Typically refers to sex acts, but not always.

From the Family Guy episode "Family Gay" in which Peter buys a retarded horse and fills the refrigerator with the horse's sperm to begin breeding it. He reveals it to the family while Stewie eats his cereal. He first looks shocked, then narrows his eyes and continues eating....

(Look up "Milky Surprise" at Hulu for the clip)

If you end up with the awful result, you can then said to have gotten the "milky surprise" (taken from the name of the clip at Hulu).
Steve: "So, I found out midway through the date that she is on drugs for being crazy, but I was hungry for companionship so I decided to risk eating the horse's sperm and took her home."

Heather: "And four month's later how's that working out for ya'?"

Steve: "Well I've had more than a few milky surprises. Bitch be crazy."

talk to a man about a horse 

A more polite method of informing people you have to go number two.
Excuse me for a minute, I need to go talk to a man about a horse.

talk to a man about a horse 

what you say when you're walking away to take a piss.
I'm gonna go talk to a man about a horse. I gotta talk to a man about a horse.

going to see a man about a horse

Going to see a man with a big dick
Tracy where you going. oh I'm just going to see a man about a horse