This is a dynamic word that means negative in general.
1.It can be used in many contexts to mean; bad, cruddy, terrible and many others.
2.Rast can also be used to describe mood.
3.Rast can be used to as a curse word.

1. OH MAHN, this food is rast.
2. MAHN, I feel like rast.
3. RAST!!!!!
by johnson balls October 28, 2007
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The opposite of dense, in every sense of the word.
Whoa my balloon just flew off! -What'd you expect? It's pretty rast.
Man that guy was rast as hell, he's like a particle physicist or something.
Sartre's 'Being and Nothingness' is NOT rast, I only got like 5 pages in...
Bro why's my boat sinking? -Because the rastity of the water is lower than the rastity of your boat, stop being so dense.
by walllu March 1, 2022
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Something indescribably “cool” or “awesome.” Often used in casual banter between friends or extremely chill people.
“Dude did you see that movie last week?”
Yeah man it was totally rast!”
by Derpybacon07 August 14, 2018
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idiotard sent me so many RAST's last nite,,
by A-F. August 2, 2009
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