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1.
the juddernaut is the rippling, or juddering, that you see in a girls arse when taking her from behind as she is pounded. Juddernaught is best seen when the girls hips are held and thrust back as your cock enters and the woman is slammed and pounded; or when the girl has a bubble butt.
I took her hardcore doggystyle and saw the Juddernaut as her arse rippelled back and forth, as she was pounded from behind.
by seaminho, aka simao July 26, 2010
 
2.
a PUN on the word Juggernaut for a person named "JUDSON" ....... JUGGERNAUT;a term used to describe a literal or metaphorical force regarded as unstoppable....
A 10 year old boy named Robert Judson Watson , "JUDDY"
AKA "JUDDERNAUT" 10 years old 5'10", 200lbs, size 13 EEEE shoes,

Juddernaut can load a bag of Porland(94lbs) cement on a truck by himself
by JudDad June 11, 2010