No beating around the bush here. It's a gay train! A group of fags get together and line up pecker to butt - hole, and simultaneously ram each other in the ass all while making train sounds.

This is not to be confused with a "gravy train"
Oh man I got so wasted in Nashua last night, I ended up in a Poo Poo choo choo all night long! But this doesn't make me gay, because I was the caboose!
by Bean town January 18, 2014
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All aboard the porcelain express!! You nestle down for what feels an epic. A high pitched fart whistles out of your puckered A-hole. There is an urgency like you never felt before.

With all your might you squeeze! Your muscles tighten just as your sphincter gives way! A mighty log of fecal matter and gas jettison out of your bungole on a one stop journey to hell! On its way down the log lays down a crooked rusty track that appears to be forged by satan himself.

The poo choo train express was quick, and brutal. It's all over in under 20 seconds. Looking down, the train wreck below leaves you sobbing in your crotch.
Kieran : Dude... go check the toilet. I think I may have caused some serious damage to my anus.

Derek : (runs to toilet - runs out) my god, are you ok? That's horrific.

Kieran : I don't know what happened. It was all over so fast. First a simple toot... then an explosion. I feel like I've been ass raped man!!

Derek : (comforts Kieran) hey big fella, it's gonna be ok. You just had your first poo choo train express. First time is never easy. It's gonna be a while before you're ok. We better go break the bad news to the toilet duck.
by K-man75 January 21, 2012
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the act of manking your male friend in the bunghole who buys drugs for you from a gay dancer
Hunter likes to poo choo train James while watching gay black porn that his brother downloaded. After that, Hunter also likes to poo choo train Stretch, also while watching gay black porn but when with Stretch, likes to stick staplers and random objects in his bunghole.
by Norbert Cotthead April 16, 2006
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A noise which indicates a lack of anything worthwhile to do, as well as indicating that one has the confidence to truly express him or her self in the company of those present.
When I am in IRC and nobody says anything for a while, an appropriate thing for me to say is:
"Poo-poo-pa-choo!"
Which would lead others to say "wtf!?" and thus stimulate conversation.
by Patrick Conheady November 24, 2003
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1. A term of endearment; one might call their loved one poo poo pa choo when they are being particularly lovley. 2. An insult. One might also use the word poo poo pa choo when their significant other is being a flaming muppet.
1. You are simply divine Poo poo pa choo.
2. Jesus Poo poo pa choo, shut up already.
by Jaclyn Stewart April 24, 2004
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