adjective meaning something that is absoloutely absurd and/or doesn't make sense.
The website preposterous.ca doesn't make any sense!
by lurker August 14, 2004
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