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A thudder is an enormous cock! Generally dressed to the side and causes problems when wearing anything shorter than knee length.

Its called the "Thudder" due to the noise it makes when it hits a hard surface (which due to its size is very often)
Ben and Mike standing at the Urinals (Ben is sneaking a look at Mikes cock

Ben: Hey Mike look at the size of my cock
Mike : zzzzzip, "THUD" *splash*
Ben: Oh thats why they call it the thudder

Mike then wakes up and realises the thudder dream needs to be let go!
Thudder by Let_Me_Go December 6, 2011
Related Words
Helping someone/doing something for them without them knowing, because they don't believe they can do it themselves.
Lucas thudded Peyton when he submitted her drawings to Thud Magazine; after she threw them in ten trash and walked away because she thought they weren't good, but they were.
thudded by ns2312 November 10, 2015
A word used to describe Thicc Tiddies.
"Have you seen Jessica?"
"Yeah shes got some thiddies."
Thiddies by MyNanrherr December 14, 2018
a penis of such prodigious weight that it makes a "thud" sound when brought out and down.
I was surprised that for a man with such a light frame he produced quite a thudder.
thudder by nanode August 24, 2009
British slang - a really heavy or massive cock or club dick, one that hits you with a deep "Thud" when it falls on your head or arm.
My boyfreind dropped his huge thudder on my face last night ... it slapped me like a rubber club, but I loved it !
Thudder by Word-Wizzard February 23, 2012

thudding 

Drinking beer all day, farting into the couch cushions.
Peter and I got a case of Pabst Blue Ribbon and spent the day thudding in his mother's basement.
thudding by Peter Shepherd April 12, 2008
More from Urban Dictionary
anyone who succeeds in disgracing/over indulging themselves in the throws of clubland
28 hours and 4 clubs later, gurning for england but still refusing to go home - a total wrongun!!
wrongun by bevvers March 21, 2007
Word of the Day on October 8, 2026

square grouper

Nickname given to bales of marijuana thrown overboard or out of airplanes. Origin is reportedly from members of the US Coast Guard in the area of Southern Florida.
"Base we've got some square groupers floating outside of Miami harbor."
square grouper by slipsheet November 6, 2004
Word of the Day on October 7, 2026
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026
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