Top definition
to be conceited without being serious
using sarcasm instead of seriousness when 'bigging yourself up'
if you are an assercast then you are conceited sarcastically
if you use assercasm then you actively are being conceited sarcastically
*sarcastic* 'oh, yes, coz im so god damn wonderful'

oh my god, that was so assercastic...
by lis.x April 30, 2007
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