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1.
Thweet is what you say when you want to emphasise just how sweet something is.
N: Check out my new garden.

J: That is fucking THWEET!!
by Croslow February 20, 2008
 
2.
The act of passing gas while wearing a thong.
She thweeted when rising from her beach chair.
by Benvenuti March 04, 2014
 
3.
a mixture between tight and sweet...THWEET!
Catherine:"G-Unit is totally thweet."
Kerry:" Yeah he totally thistled me that A+"
by CMirsky May 30, 2007