verb; to produce an in-and-out flow of drugs and blood in a hypodermic stringe chamber after the "register". This mixes the blood-drug solution prior to completing the injection, ensuring a uniform blend of drug solution into the vein, thus producing a pleasant and even "rush" or "flash".
Juan: "You got a register".
Jose: "OK, I'll mix the gravy and slam".
by dogo December 6, 2009
Get the mix the gravy mug.