Fruitcake'd 

The idea when 2 good things combine into 1 bad thing.
.
"Fruit, good. Cake, great! Fruitcake, nasty crap." - Jim Gaffigan

It's too bad "Dragon Ball: Evolution" was Fruitcake'd, it had a lot of potential.

Fruitcake'd by DerpSK September 6, 2016

fruitcake flip

The act of having homosexual relations with someone, and flipping them during the act.

“I don’t really like doggystyle, I prefer the fruitcake flip.

fruitcake flip by Lacticrabbit January 25, 2023

Mexican Fruitcake 

The product of defecating into a decorative tin and sending it to an unsavory or estranged family member for Christmas.

I haven't seen my sister in years, so this Christmas, I'll send her a Mexican Fruitcake.

Mexican Fruitcake by Skidmark4 September 14, 2010

Baldie's Fruitcake

A fruitcake made by a raving bald-headed queen from West Bridgford during a break in an all-day session of World of Gay Warcraft.

What's that foul stench coming from the kitchen, Dad?

Its that bender making some more gay food. I'm gonna take a dump on Baldie's Fruitcake tonight.

Baldie's Fruitcake by Twaggy Smidgekin October 13, 2010

M' lady Fruitcake 

Usually regarding someone wearing a fedora. They think they are above all other men for no reason at all. They possess more swords than the 2nd century and 'know' how to use them. They also 'know' they can treat a lady better than you. Trust me, they cuddle their anime pillows harder than you ever will. They are just awkward neckbeards embarrassing themselves on social media.

Hey honey look! It's one of those m' lady fruitcakes!

John is such a m' lady fruitcake. He's going to be single forever.

M' lady Fruitcake by tissy furball April 17, 2017

Few apples short of a fruitcake 

A snowclone to express that someone is either stupid or crazy. The standard format is "a few X short of (a) Y", the idea being that Y is something that, with a few X missing, is not so good, and in the case of a person being compared to such, that something is "missing" in their thought process.
This one in particular has the appeal that fruitcakes involve nuts, thus further solidifying the point that the person is nuts themselves.

Did you see how Bob just flipped out over nothing. Is he having some sort of psychotic break?
Yeah, he seems to be a few apples short of a fruitcake. Might be best to keep our distance.

Few apples short of a fruitcake by Twisted Code March 23, 2017

Nuttier than a fruitcake 

A euphemism for bat shit crazy.

My grandpa used to mow the law in nothing but a wife beater, hot pants and cow boy boots. He's nuttier than a fruitcake!

Nuttier than a fruitcake by Carly Wild May 7, 2010