An alcoholic drink made of vodka, tonic water, and a lemon wedge. Tre Cool of Green Day got the recipe of "The Cheech" from, who else, Cheech Marin. Marin didn't have a name for it, so Tre named it himself, hence "The Cheech".
Slang among physicians, especially those in training. In verb form, it refers to ordering every radiologic and lab test imaginable to diagnose a confounding (or at some institutions, not-so-confounding) illness. In noun form (also known as cheech-bomb), it refers to the panoply of tests itself.
For example the rheumatologic cheech (rheum cheech) may consist of ordering anti-ANA, anti dsDNA, anti-RO, anti-La, anti-histone, anti-scl70, RF, anti-RNP, complement, biopsies of the lungs/kidneys, imaging of the lungs/kidneys/brain.
I admitted a patient suspected of having lupus the other day, and the attending wanted me to order the rheum cheech.
Cheech is a term of affection. It is used between close friends. Being called cheech shows you are loved and valued. The term originates from Perth, Western Australia. More specifically from Chloe and co.