Fool-Aid 

when one subscribes to an idiotic set of ideas, and others follow along, agreeing with said stupid ideas, they are drinking the fool-aid

Steve -Did you see Beyonce wearing that devil ring? She is the bride of satan!

Jen (likes status) omg yes!

Mary - looks like Jen is drinking the fool-aid

Fool-Aid by deb8735 February 4, 2013

fool's paradise

1. To live in some imaginary world where everything is perfect when in reality everything is falling apart.
2. A promised way of life from a lover that they don't intend to come through on.

1. That man is living in fool's paradise, his life's a wreck.
2. She is totally leading him into a fool's paradise.

fool's paradise by Tyler Lake December 15, 2006

Fool's Paradise

When you think your dick is the biggest your partner has ever seen.

John thinks his dick is the biggest one his girlfriend ever saw, John is living in a Fool's paradise

Fool's Paradise by TheUsualSuspects January 31, 2020

fool around 

Also see hook up. To fool around: When two people, usually not currently in a relationship, find themselves kissing, participating in oral sex, and sometimes (but not always) can refer to having sex. Sometimes 'fooling around' is used when the specifics of a hookup are unknown.

Dave and Jenna were fooling around at the party.

Chris and I fool around in his car before he drops me off.

fool around by emduff May 5, 2006

fool's errand 

A task which is widely known to be unwise, yet is carried out against a person's better judgement.

He went to her house to tell her he loved her, even though her husband was home. It was a fool's errand.

fool's errand by Jon February 17, 2005

Fool's cold 

When a can or bottle feels cold on outside but is not because it was only recently added to the cooler.

Don't open that can, it's fool's cold!

Fool's cold by Bumpyjonas November 27, 2016

fool's mate 

A woman not needing the requisite 7 hours of contact prior to sleeping with a man for whom she has just met. This term originates within the PUA community.

Jake - See that blonde over there? I just banged her out in the bathroom.

Marshall - So what, she's a fool's mate. You need to raise your standards if you want to be an mPUA.

fool's mate by malarky2020 October 5, 2009