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

psssshwahhhh 

to choke the chicken, to jack off, to masturbate. used in public areas so that people don't know what you're talking about. especially helpful in situations where small children are around. also used by prude girls who don't want to admit they're talking about sex.

EXAMPLE 1
guy 1: wow, did you see that sluts myspace??
guy 2: yeah, after ten seconds i just had to psssshwahhhh.
guy 1: haha, thats what she said

EXAMPLE 2
girl 1: omg, i walked in on kevin doing you know what yesterday
girl 2: huh? what are you talking about
girl 1: he was...yknow...
girl 2: psssshwahhhh??!
girl 1: yeah

psssshwahhhh by miss stephanie love May 11, 2007

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