foul up 

a liquid - like, uncontrollable explosive bowel movement, usually unexpected.

I walked into the bathroom and there was shit everywhere, looks like someone had some kind of a foul up in there!

foul up by Deeeeee December 27, 2007

foul ball 

A cancerous testicle.

Richard thought he had a hernia but it actually turned out to be a foul ball. They popped that sucker out and dropped a new superball in his sack.

foul ball by kajoe December 7, 2006

foul-weather friend 

a sucky friend who is not there for you and probably talks a lot of shit behind your back. they only care about themselves and their problems.
point is: they don't deserve you.

she is a very foul-weather friend.

foul-weather friend by blueyedgirl8484 April 10, 2008

Foul beast

Callum is the foulest of all beasts and he looks like a foul beast and his mating call sounds like Minecraft sounds. He has teeth like a rabbit 🐇 and kills you with his looks and has every disease ever recorded

The foul beast killed a man

Foul beast by Hgffhjuy October 24, 2019

Foul Play 

It's when you give fellatio to a chicken...

david: "cough, cough, cough*" (while making his dinner)
vanessa: "you alright there dave..?"
david: "yeah, just giving fellatio to a chicken"
vanessa: "oh, umm.. are you telling me your pecking at his pecker?
david: "yep, i'm deep throating the cock's cock!"
vanessa: "guess you would call that...foul play"

Foul Play by NessaceryAction September 1, 2009

Foul Tipped 

The act of having sex with a girl that has a foul odor between her legs, and only able to get the tip of a males penis in her before gagging.

I was going to bang that chick from the club last night but I only foul tipped her, she stunk so bad.

Foul Tipped by Obiwan58 March 26, 2013

Foul Ball 

Finding out said person is a post operative transexual after oral sex

I rounded third base only to cry foul ball

Foul Ball by Hawt Stuff March 4, 2009