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."
by Clintacus February 7, 2010
mugGet the to risk eating the horse's spermmug.
slut, especially one that performs a lot of oral sex
"That bitch has sucked so much cock she's a walking talking sperm bank
by Al Jezera April 7, 2003
mugGet the walking talking sperm bankmug.
noun - a boozy slut who hangs around the same bar every night looking for new guys to give blowjobs to.
"Man - I saw your new girlfiend - a sperm-burping tavern-wench if I ever saw one. She's got a face like the one on a bottle of poison".
by Billy Cruddup September 6, 2008
mugGet the Sperm-Burping Tavern-Wenchmug.
A person who gives a lot of oral pleasure. See also cum dumpster.
She sucks so much cock that she's a walking talking sperm bank
by KingofSpain357 May 13, 2005
mugGet the walking talking sperm bankmug.
Refering that someone gives men lots of oral sex.
Dude back off you sperm burping gobble dick!
by Bushy Bob September 22, 2009
mugGet the sperm burping gobble dickmug.

Toxic Sperm Buildup TSB

Scientist report that men working on oil platforms commonly suffer from a condition called TSB or Toxic Sperm Buildup.
This condition arises when the said man is separated from the woman that he loves.
Symptoms include a very ill attitude, loss of sleep, morning tent, and the symptom most dreaded by all the said mans closest friends ........phone ear.
Sadly the condition only has one cure.
Like everything else if you soak it in cider that will make it all better.
by Marty and Michelle June 10, 2005
mugGet the Toxic Sperm Buildup TSBmug.

Sperm Burping Road Whore

She is a sperm burping road whore that will fuck anyone for cash.
by dogglue January 31, 2010
mugGet the Sperm Burping Road Whoremug.

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