drunken miscalculation 

Any and every time of regrettable decision or action made while under the influence of alcohol.

Yeah, I know, it was a total drunken miscalculation.

drunken miscalculation by McWebster August 19, 2010

miscalculated 69 

Where you end up having sex because dopey fuckwits like yourself don't know that 6 and 9 are the opposite way around

I was born due to a miscalculated 69

miscalculated 69 by MacSki December 20, 2013

mastubatory miscalculation 

Whe a male masturbates and he miscalculates the force of the said ejaculation and proceeds to splash his own spooge on his chin or other facial area!!!

Dude i had a mastubatory miscalculation last night and came in my own mouth!!! It sucked!!!

mastubatory miscalculation by vinny125125 September 9, 2010

anal miscalculation 

not to be confused with anal fraud

1. that's thinking youre hitting backdoor but realize you have been hitting straight back fat the moment you are about to nut. So you have to slap her in the back of the head and tell her she's trying to fraud.

dom:" I thought I was fucking this girl in the ass last night but I was just fucking her back fat so i had to slap her"

eddie:" that's an anal miscalculation"

anal miscalculation by rampage eddie June 3, 2013

Hanes Miscalculation 

(n.) the act of wearing an unflattering pair of underwear, erroneously calculating that no one would see you in your underwear for the day.

Can apply to faded, fraying, or everyday underwear brands such as Hanes or Fruit of the Loom. Is often a symptom of stag reflex.

Person 1: Lauren saw me in my workout-only boxer briefs today
Person 2: An unforgivable Hanes miscalculation.

Hanes Miscalculation by nolandc September 15, 2019

Miscalculaneously 

To make a miscalculation on something you never calculated in the first place.

"After hearing about Connor's final exam, Martha miscalculaneously stated his score."

Miscalculaneously by Sealpower December 10, 2020

Cosmic miscalculite 

An intelligent person who is capable of doing math but, for reasons of entropy/fate/providence/bad luck, gets the answers wrong anyway, even to the extent that even math teachers are stumped as to why.

"I checked my answer 20 times. 20 TIMES! And the teacher checked it five times! I showed my work twice over. Neither of us knows how I got question 4 so wrong."
"You poor cosmic miscalculite..."

Cosmic miscalculite by gorpoglorp January 28, 2023