1 definition by walllu

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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