Green’s Dictionary of Slang

1. an academic, esp. one who trades on the proliferation of current, if ephemeral, intellectual fads.

1977		Meanjin Quarterly Jan. (Melbourne) n.p.: acca (slightly derogatory) 1, noun An academic rather than an intellectual, particularly adept at manipulating trendologies, usually with full scholarly apparatus. Hence 2, noun A particularly sterile piece of academic writing.
1999		G. Seal Lingo 164: acca yakker includes self-deprecations like acca for an academic.

2. quotidian, jargon-laden academic writing.

1977

see sense 1.