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Pronounced with the highest voice possible. It is said when the circumstances or actions of a person are extremely ridiculous. The history of this word comes from when Thomas' mum, in response to the question, "Does Thomas have a girlfriend?" answered "No, Thomas thinks girls are silly!" This story has evolved into one where Thomas' mum says the sentence extremely quickly and with a very high voice, hench the pronounciation of silli. Silli can be used in addition to other words that sound like or ryhme with silli eg. 'willy' or 'little'as long as the other words are said in a high and fast tone.
1.
Jim:"Shit, Miss Kent just blew up the chemistry department becuase she mixed potassium phosphate with magnesium nitrate!"

John: "Silli!"

2.
Jim: "Did you hear what James did? He tried to break into Billy's house but he went to a council flat in Balham!"

John: "Thats a little bit silly becuase Billy lives in a pavillion in Picadilly!"
Silli! by Phaidan October 22, 2006
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Sillier than a bag full of assholes 

describing something or someone appearing homosexual.

Sillahillabilla 

Slang word mentioned or referenced often in rapper Clifford "T.I." Harris' verses referring to Summerhill Village in Atlanta; a housing project located in Bankhead, where T.I. grew up.
"I take my ass right back to sillahillabilla compound come down everyday sell yay" -- from T.I.'s "I'm talkin' to you"


Sillahillabilla by neuromant April 8, 2009
A person whose integrity is based only within the context of a single transaction.
The shill sold me a line about his brand of mullet conditioner, but his pitch had the sound of an ulterior motive. It turned out that he had been recruiting for the Mullet Party, and the conditioner was just a bottle of liquid dish soap.
Shill by Sporkmeister March 9, 2010

Spillage Idiot 

The friend who always manages to spill something when they come over to your place.

Note: The spillage idiot can often locate items to spill where there were previously believed to be none. This often happens in student dwellings.
Crash! Glug, glug, glug..
S.I.: "Whoops, sorry!"
Rug-owner: "Argh! You fool of a took!"
S.i.: "It wasn't there a minute ago."
Rug-owner: "Oh Reeaally? That would mean something if it wasn't coming from the Spillage Idiot. Oh, hang on, that's my girlfriend's mug.. it hasn't been seen for months.. how..did..?"

Spillage antics leading to serendipitous findings automatically promote the S.Idiot to the position of Loom Raider, Ruiner of Rugs.
Spillage Idiot by Chandra42 October 27, 2008
nickname given to those who have had a terrible accident on some form a two-wheeled mode of transportation; very rarely come across and sometimes mistaken for "spills" a nickname given to those who commit frequent party fouls. collin
spillz by moose+10 February 5, 2009

spillage idiot 

Taking its name from the already popular phrase 'village idiot', spillage idiot refers to a person or persons who spill stuff when in the company of others.
haha look at waudby he just spilt carrot juice all down his new gola tracksuit. What a spillage idiot!!
spillage idiot by TIN Laden December 15, 2010