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bitchin’

[bich-uh n]
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adjective Slang.
  1. marvelous; wonderful.
Also bitch·en, bitch·ing [bich-ing, -uh n] /ˈbɪtʃ ɪŋ, -ən/.

Origin of bitchin’

bitch + -in’, -en  informal or dialectal variant of -ing2 (here forming nonparticipial adj.)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for bitchin'

bitchin'

US slang bitching (ˈbɪtʃɪŋ)

adjective
  1. wonderful or excellent
adverb
  1. extremelybitchin' good
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012