1. An adjective taken from the root words of grim and darkness, both of which are featured in the tagline for Warhammer 40,000: "In the grim darkness of the far future there is only war." It is usually used to describe a setting that would equal poor living conditions and life expectancies for those actually living in it.
"Man at 4chan they have this totally grimdark picture of Inspector Gadget."
They are known for low ASVABs, getting kicked out of Aircrew and Crash Fire Rescue Schools, and hernias. Known for their famous moto of "1,2,3, LIFT!" That may as well replace IYAOYAS whom they stole from Amphibs anyways.
1. Team Leader: "Okay lets get this AIM-9 up on this jet."
"Ready in the Front? Ready in the Back?"
2. Airframer: "Man wish I was an Ordy! Then I get all big and strong!"