Green’s Dictionary of Slang

gazabo n.2

[SE gazebo, a form of garden hut, or a turret on the roof of a house]

(US) the mouth.

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C. M’Govern Krag Is Laid Away 119: It ain’t the funeral of no enlisted men like us, with three and four parchments to our record, who ain’t supposed to open our gazabos but do just what the officers commands us, whether they know the Regulations or not [HDAS].