Gideon

Gideon is a transport vessel within the Fleet.

During Laura Roslin's removal from office and Colonel Tigh's enactment of martial law, Colonial marines lead by Lieutenant Joe "Hammerhead" Palladino killed four unnarmed civilians during a riot on that ship.

The civilians onboard were protesting Roslin's removal from the presidancy, martial law and the dissolving of the Quorum of Twelve, as well as hindering in an effort to resupply battlestar Galactica. During the protest, where coffee and other objects were thrown at the Galactica party, the marines heard a shot. Believing that they were under attack, they fired into the crowd, until Palladino managed to weekly regain control of the situation after the damage had been inflicted. (Resistance)

Etymology

Gideon is the name of one of the biblical characters in the Book of Judges.

Original Series definition: the equivalent of saying "objection" in a Colonial Tribunal (TOS: "Murder on the Rising Star")

Galactica 1980 definition:  Dillon looks up this term after Jamie Hamilton orders a coffee at a diner, upon their return to 1980 Earth (1980: "Galactica Discovers Earth, Part III").