off one’s chump
Preserved but no longer current.
Meaning · English
To be crazy is to be OFF ONE’S CHUMP; this is varied by the word CHUMPY. A mild kind of lunatic is also said to be "off his head," which means of course exactly the same as the first phrase.
Era: ca. 1874 (Victorian)
Where it’s used:
Origin
British & Irish English
Sources & notes
Historical definition reproduced from Hotten’s The Slang Dictionary (1874, public domain; Project Gutenberg #42108, retrieved 2026-07-31). Reflects the attitudes of its era.
Common questions
What does “off one’s chump” mean?
To be crazy is to be OFF ONE’S CHUMP; this is varied by the word CHUMPY. A mild kind of lunatic is also said to be "off his head," which means of course exactly the same as the first phrase.
Is “off one’s chump” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.