A corruption of the term "shipload" of antiquity, as described the massive cargoes brought into harbor by sea-faring ships. Through association to the perjorative "shit" (itself a corruption of "shite"), the terms "fuck load", "ass load", and "butt load" were all created, the user, unaware of the origins of the term, substituting one curse word interchangeably for another. Over time, the second half of the expression also came to be substituted, most often in cases where "ton" was inserted for "load", whilst still maintaining the previously-replaced derisories as variations of the newly-coined phrase.

In its "proper" form, the phrase would be hyphenated and expressed as a linkage between two words to describe a third, correlated concept (i.e. "shit-load")
Americans commit a shit load of atrocities against the English Language!
by Sidgar July 08, 2013
(Colloquial) The amount of cow manure that will fit in the bed of a 3/4 ton pickup. For fresh, wet, stinking manure, this would be 750 pounds. For dry manure, something less, perhaps 500 pounds.
I have to go over to Jackson's farm and get a shitload of manure for my mom's garden.
by OldFskingGeek July 10, 2013
A unit of measurment.
Questionably comparable to the size of one's shit.
I just ate a shit load of jelly beans.
by Agravi May 02, 2011
Less than a butt-ton.
Man, I've got a shit-load of homework.
by csilwy October 31, 2003
A shit load is enough fecal matter to fill a toilet bowl. However, if that load plugs the toilet, it is deemed a shit overload.
Kenny: "Call the plumber! David had a shit overload!"
David: "No, no, it was just a shitload. She went down just fine!"
by The can man. December 01, 2011
The amount of anything it would take to fill YOUR toilet up to breech the water level.
DAMN that is a shit load of SHIT!
by THEKosherDillWhole May 14, 2009
Anything that is over 1000 lbs.
that bitch weighs a shit load
by Overseer April 08, 2005

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