ACTN Share definition Flag An abbreviation for "action" that was created by the Adult Swim team at Cartoon Network and is frequently shown in bumps between TV shows. It is often referred to in relation to anime. ACTN=ACTioN viola! ACTN by hack3r March 29, 2009 0 0 Get merch Get the ACTN mug. Buy Now — $32.95 See more merch
