Solid - A favor received which Fixit considers gives the donor immunity (from being killed anyway) around him.
Dude - Someone whom Fixit feels might be, one day, worthy of a modicum of respect.
Bro/Sis - A person who has earned a degree of Fixit's respect.
Brah - Someone Fixit considers essentially an ally - three known examples total to date, including Stepan Gregorovitch Novykh.
Cold - A motivation or action which contravenes his personal code, usually inflicting excessive pain.
Not cool - A slight which mandates rapid, clear repayment.
So not cool - The performer is, in all probability, in the immediate vicinity of their last meal.
Exactamundo - When someone else finally catches up with a thought he outlined previously.
Them's the breaks - A scenario which plays out as Fixit predicted, against the desires/expectations of others.
Know when to fold'em - Fixit's prelude to walking away from a scenario which has become non-viable.
Lich - Someone in the intel community who is taking credit for kills they didn't make.
Contractor - One, like Fixit, with an intel community skill set, but working freelance.
Vendor - A 'contractor', but one whose word cannot, inherently, be relied upon, changing loyalties with great regularity.
Ghoul - A contractor with whom Fixit has personal animosity (and therefore unlikely to enjoy a long life).
Shadow - A former spook, now retired or, in Fixit's opinion, off his/her game.
Flatline - A former intel operative who, for stress or personal reasons, quit the business while at the top.
Old hand - A retired or at least no longer field active operative, but still with a skill set to be respected.
Markov - A clean, public kill, with no witnesses and no one any the wiser, until too late.
Game over - A one-time target with whom Fixit refuses to re-engage for personal/moral reasons.
Leaf in a forest - Multiple kills, in order to disguise the identity of the true target. Fixit will no longer run these, on moral grounds.
Blitzing linebackers - Creating a public stampede, or similar, to facilitate ingress/egress at the target location.
That's the way they make you - An unforced error of the kind/caliber which leads to identification.
Upside - Non-material profit to an elimination.
Bad egg - An acquaintance who will no longer have earthly concerns after their next meeting.
Heads-up - As much warning as his professional integrity will permit him to give, but usually, in his own assessment, a sporting chance
Coll - Collateral kill, now largely unacceptable to him.
Five by five - Completely, positively resolved scenario, with no obvious potential for future grief.
Aces and eight - A lose/lose scenario, with reference to the infamous "dead man's hand".
Spin - A situation with indeterminable variables. Flat spin - as preceding, but caused by current interlocutor.
All these are obviously in addition to the standard cant.