Pssssshhh

Pssssshhh, is the sound of hot air comming from an object or also can be used to imply that what is being said to you is bogus.

It could be the the releasing of steam from an object for example: The hot water heater is smoking and making a Pssssshhh sound.
or,
It could be a sound that one person makes to another for example:

Tom: "I'm gonna win that race, i'm the fastest cat in town!"
Jerry: "Pssssshhh, dream on Tom Cat, everyone knows the mouse always wins!"

Pssssshhh by N!ke October 20, 2010

ssssshhhhhhheeeeeeeiiiiiiitttttt 

way of saying "shit" often used in the ghetto

ssssshhhhhhheeeeeeeiiiiiiitttttt, did you see tyreses chain?

ssssshhhhhhheeeeeeeiiiiiiitttttt by ALBAL1028 April 15, 2014

Pssshhh 

meaning "whatever"

A: "yo aint gotz no skeyulz"
B: "psshhh thatz not wut yo momz sayd"

Pssshhh by chris October 23, 2002

pssshhhh 

the best way to say "who cares" or "it doesnt matter"

we got a history test tommorrow

pssshhhh

pssshhhh by Ethan January 27, 2005

pssssshaw 

pssssshaw: it means duh or ya

Person 1: Is that a new jacket?!

Person 2: pssssshaw

pssssshaw by person that is here November 1, 2009

PSSSSSSHHHHHHH 

n. - The noise emmitted from a blow-off valve in a vehicle equipped with a turbo forced induction system when excessive back pressure is released. Excessive back pressure is created when the throttle is closed during gear changes or deceleration, causing turbo cavitation.

There is an orange SRT-4 here with black rims on it that has this blow-off valve thing all the time... like he just lets go of the gas when he is going 20 km/h and PSSSSSSHHHHHHH ...I mean I have an air compressor and if I turned it on and then undid the drain plug it wouldn't make so much PSSSSSSHHHHHHHing

PSSSSSSHHHHHHH by 06Accord at RDNet May 1, 2006

PSSSHHHWNED 

When your playing a stealth game and want to say pwn but stay quiet you say 'Pssshhhwned'.

Player 1: *Shoots teh n00blet*
Player 2: He got PSSSHHHWNED!

PSSSHHHWNED by MRPWN. January 15, 2007