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When you put a fist in someone's ass and open your hand as wide as possible. This is also known as a "Staten Island tsunami"
I was fisting my girlfriends ass and decided to go for the flumper.
FLUMPER by TbagMartin March 23, 2010
The emotion of feeling drained out and worthless, no strong emotions running through your head. Almost like your tired and carnt be botherd to do anything that involves deep concentration or any physical activity.
'are you coming out later pete ?'
'nah, sorry i feel flumped robert.'
Flumped by PG :) September 1, 2009
fumpin is a term used by many people in the north of england, it can mean many things, however it is mainly used in the context of good or great, its often asociated with indie kids there for making it an indie cliché.
Indie Kid 1: This partys fumpin

Indie Kid 2: Its fumpin becuase im here ;)
fumpin by (: :) (: :) June 7, 2009
Using the right words or actions, at the right time to get the best result.
Being in the zone while orating or writing.
He was in the zone, he was fumprin all night long and definitely got a lot of tail.
Today was the first debate for the new candidate. If she was nervous she didn't show it. She was fumprin and the audience was loving her.
Fumprin by Fumprer July 31, 2012

Fumptruckery 

A SFW (Safe For Work) definition of what Donald Trump is doing to the country.
The recent unconstitutional ban on immigrants from seven predominantly Muslim countries is an example of the Fumptruckery that Donald Trump is putting in place.
Fumptruckery by chaoticmoth February 11, 2017

colonic fumes 

Noxious farts
Deadly colonic fumes were emanating from Donald's asshole