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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