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foul-weather friend 

The opposite of a fair-weather friend, a foul-weather friend only seeks you out if they have a problem, need a shoulder to cry on, a ride to town or someone to watch their dog, but otherwise they act as if they don't even know you. They're only your chum when they're glum.
A foul-weather friend will never call you to go out with other friends, go to a show or just go hang out, but the minute trouble comes, your foul-weather friend knows you are good old reliable you, the one who will listen when no one else will, and they act like you're their only friend. Don't expect the same in return either. When you've got a problem, they'll usually tell you not to bring them down.

foul loathsome evil little cockroach 

“you! you foul loathsome evil little cockroach!” “hermione nooo, he’s not worth it

foul play 

murder, actions that are not playing fair
Police suspected foul play in disappearance of Mitchell's girlfriend.
foul play by cheatingdeath November 13, 2007

Foul-weather friend 

A friend who is there for you when your down, but is no where to be seen when your happy.
He is a foul-weather friend, he is always there for me but I never see him when I’m happy.

foul mood 

Foul mood can best be described as a mood in which one no longer feels happy or content.
Foul moodedness can be associated with being grumpy, being an asshole, or just flat out being a cunt to others.
One who is in a foul mood will not want to deal with stupid people, talk to anyone, or may feel the need to curse anyone or anything out.
I was working and having such a great day today. Then a customer told me I was stupid and ruined it.
I'm in such a foul mood right now.
foul mood by JenJentastic September 20, 2013

foul mouth 

Someone who uses a lot of profanity and isn't even aware how offensive he/she is being.
V-Bo is always talking about how men clean their genitals and she sure likes to say the words 'bitch.' She is a foul mouth!
foul mouth by ponyup May 19, 2009