CIGAR or CIGARS is a mnemonic that refers to a pre-takeoff checklist performed by general aviation pilots. The mnemonic stands for:

Controls Instruments Gas Airplane secure Run-up.

Alternately:

Controls Instruments Gas Attitude Run-up

Yet another version was used by the U.S. Air Force:

CIGarettes For The Poor Russian Soldiers:

Controls Instruments Gas Flaps Trim Prop Radios Straps.

References