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4.
A thwat is a thought that has been rendered in 140 characters or less so as to make it tweetable.

In most cases the meaning of the original thought when rendered as a thwat is compromised.

As with a meme (an idea denuded of meaning) a thwat might be thought of as thought without the thinking.
Any quote on the internet attributed to Oscar Wilde is unless contextualized in a thought a twhat
by mediumkool November 01, 2011
 
1.
another name for the vagina
Girl yo twhat stank!
by Teria June 21, 2006
 
2.
another name for a vagina
Twhat did you say? I cunt hear you. I have a ear inFUCKtion.
by jjew August 06, 2010
 
3.
See: twat

Pronounced "Twhaaaaaat??"

Generally a word subtly replaced with "what" when someone you don't like says something to you from a distance or you can't understand what they said.

You can call them a twat without them knowing and silently giggle to yourself.
An angry boss:

"Hey John! GET BUSY OR PRETEND LIKE YOU ARE!"

John replies like he didn't hear him

"TWhat?"

"Twhaaaaaat?"

Similar to

"I cunt hear you"
by Revolutifairy April 21, 2010
 
5.
(pronounced Tw-hat)
A twattish hat, a hat that someone (usually a guy) wears that they think makes them look cool but they just look foolish and annoying!
"Justin Timberlake has a large twhat collection"
by Blame The Rainbows August 07, 2005