scatalanche 

A powerful explosion of greasy, runny shit from your ass, such as you might have after eating 10 White Castle hamburgers.

Mikey barely made it home from White Castle, sprinting to the toilet for the scatalanche from hell.

scatalanche by VelvetB August 14, 2009

Shavalanche 

The act of one's rectum muscles relaxing so completely that feces flows out without any effort or control devastating all in its path like an avalanche.

ohhhh bro after eating that taco I was hit with a series of shavalanches all night long.

I got so pitted I shavalanched my pants.

Shavalanche by Shiavo August 19, 2009

spamalanche 

An excess flood of spam.
Usually occurs during a chat or when opening your email inbox.

(In a chatroom)
6ubl3rf4n: I know, so cool
DarkLight: mah fav movie 2
random spammer: *&^*(OIUGHUIHGtghy97tfy7y9u9ugt7yfut7ig
random spammer: UIHGY(&T&YUIH&y80iout798^&(*^*Uihgyihgt79y*U
random spammer: T&*OUIYT*UOIHGTY*89uiokj
random spammer: ty9oihgft7989
DarkLight: hey! stop that
random spammer: UYOIHGYui809iuhoj
DarkLight: wat going on?
6ubl3rf4n: Oh noes! run its a spamalanche!

(when opening your inbox)
George: What th--? 20 new emails?
Jayne: 20? Who're they from?
George: Ah, forget about it. They're all spam...
Jayne: (laughes) you've just been hit by a spamalanche

spamalanche by 6ubl3rf4n April 15, 2009

Savalanche 

When Sav busts a load on your face and you fall asleep with it on. Then the next morning you realize it was Sav's jiz on your face, so you leave it on for the rest of the day for the world to see.

Half of Connecticut's female population is currently walkin around with a savalanche.

Savalanche by Jake88 November 10, 2008

catalanche 

When 2 or more cats run down a flight of stairs, causing a rumbling sound and knocking over everything in their path. This often due to excitement and/or food.

"What happened to you, James? You look like you got in a fight."

"No, no...I just got caught in a catalanche and was swept down the stairs."

catalanche by James Gerraughty August 18, 2007

Spanalanche 

A load of Spanish chavs running towards you with their pathetic hair styles and "bum bags"..! They normally run for English people, or just small people.

"Look Olivia it's a spanalanche..!! RUN..!!!"

Spanalanche by Unika March 10, 2008

Shartalanche 

Severe "brown snow" weather incident. Usually accompanied by gale force winds, and heavy precipitation.

(1) James warned Chris : "If you drink any more real ale and have to visit the toilet, you will have a shartalanche on your hands ..."

(2) Pierre had eaten some bad mussels for lunch. His decision to go off-piste skiing carried a high risk of starting a shartalanche ...

Shartalanche by Fubby May 18, 2006