death mechanic 

is someone who maintains or fixes the implements of death.
I.E. an Army Helicopter Mechanic, or Air Force Jet Mechanic.

Marty was a trained Death Mechanic, as he worked solely on The F-35 during his time in the U.S.A.F..

death mechanic by TommyRock13 August 27, 2014

Death by mechanical pencil! 

It is when you grab a mechanical pencil of any sort and threaten someone with it verbally, or just wield it like a madman

DEaTh By MecHANicAL PenCIl!!!!

Death by mechanical pencil! by Kaylathecat8 June 7, 2018