trig out Share definition Flag v. -to act out in a spastic manner, often witnessed in the retarded...in extreme episodes the person may exhibit retard strength "Did you see that kid on the short bus trig out? I think he broke his helmet!" trig out by Gurthy Johnson December 9, 2008 0 0 Get merch Get the trig out mug. Buy Now — $32.95 See more merch