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adjective meaning something that is absoloutely absurd and/or doesn't make sense.
The website preposterous.ca doesn't make any sense!
It's preposterous.
by lurker August 14, 2004
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Apr 18 Word of the Day
Joe: my mom died yesterday

John: bruuhh

Joe: Yo my mom just won million dollars

John: bRuHhh

Joe: my mom made dinner for us
John: bruh
by I eat forks with noodles October 30, 2019
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2
Preposterous means without sense.
Something or an act is preposterous if is has no beneficial effect after it's done and it's often impossible

to do it anyway.
It's an preposterous idea, but imagne getting into a spaceship for a ride with aliens.
by Aralk December 31, 2016
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3
Absolutely unacceptable to the s.o.b. who likes saying these big ass words
Brittany always beats my ass severely in bomberman. That shits just preposterous..propos..preopst...possum! ..bitch
by MaMa B January 11, 2015
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