Imprompter 

Used to describe what happens when the teleprompter goes blank while a speaker is reading from it, the words uttered after that are almost always improper.

Did you hear the imprompter words spoken by the president last night, I'll bet they fired the teleprompter operator immediately.

Imprompter by 2B+ September 7, 2013

Improper 

Improper is an adjective; it refers to conduct which is not in accordance with accepted standards, especially of morality or honesty. It can also mean behaviour lacking in modesty and decency.

Some Americans think that Donald Trump’s behaviour is improper.
The behaviour of Malcolms is improper.

Improper by AKACroatalin March 1, 2017

Impromptune 

To give in to the overwhelming desire to break into song while listening to your iPod.

This is the best song, every time I play it, I want to impromptune.

Did you hear the guy on the train impromptuning to Barbie Girl?

Impromptune by K-Bear June 5, 2015

Impromptuvationalist

A lifestyle choice a person makes about how to live and behave, according to an attitude stemming from impromptu decision making. Decisions are made sporadically, without previous preparation or thought.

A state of being pure in each moment.
Going off of what "feels right" in a particular instance without planning- One remains unscripted, raw, unrehearsed.
No hesitation involved.

Living a lifestyle in extemporization.

It's also the perfect excuse for poor decision making; however, it will NOT have you exempt from pregnancy, or STD's-

Example:

(female) "Why didn't you wear a condom? What do you think you are, one of those impromptuvationalists?"
(male) "Actually, I am..."
(female) "Well, I'm a Catholic, so it looks like we're BOTH going to be parents."

(Customer) "Excuse me, Miss? My first drink came with a lemon wedge, this second was served with a lime..."
(Server) "I thought you'd enjoy variety as the spice of life! I'm an impromptuvationalist, it just felt so right."
(Customer) "Oh, in that case- Surprise me on my third! I love what a good impromptuvationalist will throw my way! You must have such a free spirit."

Impromptuvationalist by EmilyaBear August 15, 2014

impromptofu 

1. Tofu that's been offered without being planned, organized, or prepared.

Damn, a vegetarian came to the BBQ. Better serve him some impromptofu.

impromptofu by impromptofu November 24, 2015

impromptu 

Something that is made up on the spot and given little time to gather and present. Usually referring to speeches that are given only a few minutes to prepare for.

I had to write an impromptu speech about Anal Cancer in 3 minutes without using the word 'ass' 'anus' 'shit' or 'hair'.

impromptu by Bastardized Bottomburp September 26, 2003

impromperaneous 

adj: a term for something made up on the spot, a mixture of impromptu and extemporaneous

That joke was so sudden, it was impromperaneous.

impromperaneous by Lutheran Pirate December 6, 2005