Green’s Dictionary of Slang

(orig. US) oblique, awry, also as adv.; thus slantindicularly.

1834		‘Jack Downing’ Andrew Jackson 42: He give his pistol a slantendicular direction.
1839		J.T.J. Hewlett Peter Priggins in New Mthly Mag. pt 2 225: I took particular care to slew the buttons at the knees well forward in a slanting-dicular direction .
1843		Gleaner (Manchester, NH) 2 Sept. n.p.: We saw her and a lad in rather a slantendicular position the other day.
1843–44		Dickens Martin Chuzzlewit (1995) 346: I might venture to conclude with a sentiment, glancing — however slantin’dicularly — at the subject in hand.
1845		N.Y. Dly Tribune 6 Feb. 1/3: It is well enough to intercept anything coming down perpendicularly, but ‘slantendicularly’ as friend Slick says — no.
1846		D. Corcoran Picking from N.O. Picayune 122: ‘Don’t Bridget, a cushla,’ said the man who wore his hat slantingdicular.
1849		Bell’s Life in Sydney 20 Jan. 3/1: [He] accused his master of [...] having slantendicularly applied his dexter mawley to his [...] sinister listener.
1860		Hotten Dict. of Modern Sl. etc. 217: slantingdicular oblique, awry, ? as opposed to PERPENDICULAR.
1866		Letters by an Odd Boy 165: Uncle Sam [U. S.] has sent us several cargoes of slang terms more or less familiar: a ‘splendiferous slantindicular rumbustious,’ dialect calculated to ‘raise the dander,’ ‘put in an awful fix,’ ‘catawampously exflunctify,’ cause to ‘cave in,’ ‘absquatulate,’ and ‘slope,’ the ‘stranger’ to whom it may be addressed.
1872		Schele De Vere Americanisms 634: Odder still is Slantendicular, a word evidently made up from the verb to slant and the latter part of the word perpendicular, and now well known in English High Life below Stairs.
1872		Dly State Jrnl (Aleandria, VA) 1 June 1/5: We have taken his rays perpendicularly, slantendicularly and horizontally.
1879		‘’Arry on ’igh Art’ in Punch 1 Feb. 42/2: Slantindicular saints on the goggle, and mooney young women in grey.
1887		Buffalo Commercial (NY) 8 Sept. 2/2: Unhappily, the walk of Mittklewicz has not been upright but ‘slantindicular’ .
1898		(con. 1875) F.T. Bullen Cruise of the ‘Cachalot’ 40: Suddenly our boat fell backward from her ‘slantindicular’ position with a jerk.
1899		Barton Co. Democrat (Great Bent, KS) 15/4: Grooves that ran slantendicularly.
1910		Richmond Item (IN) 20 May 4/2: The walk of Pherndiwud was slantindicular.
1925		Indianapolis Star 20 Apr. 6/8: Others may want to know if Elijah went straight up or a little slantindicular, before taking the leap.
1934		Pittsburgh Post-Gaz. (PA) 29 Oct. 8/2: Britain is herself almost Japanese in following the ‘slantindicular’ course.
1949		Times Herald (Port Huron, MI) 17 Aug. 2/3: If an object was described as slantindicular, what would that indicate?
1966		St Louis Post-Dispatch (MO) 24 Apr. 131/2: He looked up at me slantindicular and I looked down on him slanchwise.
1976		Green Bay Press Gaz. (WI) 20 Aug. 34/3: ‘Catawampus’ [...] has various meanings ranging from ‘cater-corner’ to ‘slantindicular,’ the latter meaning anything that is not quite straight or a bit on the skewgee.
2002		Palm Beach Post (FL) 24 Feb. 126/6: The trees in the park looked crooked seen through the slantindicular window of the leaning tower.
2012		Times Recorder (Zanesville, OH) 11 Jan. 1/1: [headline] Sixth-grader wins district-wide spelling bee with ‘slantindicular’.