" Christmas. Cf. CRIMBLE n. Also used in interjections: cf. CHRISTMAS n. 1c.
1928 Strand Mag. July 70/1 306 You've saved your man, by crimbo. 1966 P. MOLONEY Plea for Mersey 63 Dick Crimbo = St. Nicholas. 1989 Looks Dec. 5 Worth cancelling a crimbo party to catch this one, it's totally fab. 2001 GQ Nov. 122/2 A crisp £20 handed to the dustman just before Crimbo may seem like sheer profligacy."
" Christmas. Cf. CRIMBO n.
1963 J. LENNON in Beatles Fan Club Recording in New Musical Express 6 Dec. 10/2 Garry Crimble to you, Garry Crimble to you, Garry Bable, Dear Christmas, Happy Birthday, me too! 1987 Just Seventeen 16 Dec. 6/2 Stevie's determined to have a well-wacky Crimble do. 1994 Sun Zoom Spark Dec. 22/3 Couldn't we just shut him in the attic and let him out for 12 days around Crimble along with the baubles and tinsel. 2002 Observer 6 Jan. (Business section) 7/8 As..only 300 digital radio sets were in the shops this Crimble, the company's performance on the stock market shouldn't really be a surprise."
And Rhubs, the OED kind of disagrees with you:
Forms: 19- Chrimbo, Crimbo. Also with lower-case initial.
Christmas. Cf. CRIMBLE n. Also used in interjections: cf. CHRISTMAS n. 1c.
1928 Strand Mag. July 70/1 306 You've saved your man, by crimbo. 1966 P. MOLONEY Plea for Mersey 63 Dick Crimbo = St. Nicholas. 1989 Looks Dec. 5 Worth cancelling a crimbo party to catch this one, it's totally fab. 2001 GQ Nov. 122/2 A crisp £20 handed to the dustman just before Crimbo may seem like sheer profligacy.