Green’s Dictionary of Slang

oration-trap n.

the mouth.

1860		Glasgow Herald 20 Apr. 4/3: ‘Kisser,’ ‘tater-trap,’ or ‘oration trap’ for mouth.
1886		Morn. Post 4 Aug. 5/1: He described a terrific blow to the mouth as ‘a smart one on the oration trap’.
1903		(ref. to 1810s–50s) Bulletin (Sydney) 23 July 21/4: The mouth was variously known as ‘potato trap,’ ‘kisser,’ ‘kissing organ,’ ‘ivory box,’ ‘oration trap,’ ‘whistler,’ ‘sucker’ – all are expressive terms.