- Informal. a stupid person; dolt
- a short, thick piece of wood.
- the thick, blunt end of anything.
- Slang. the head.
1703, "short, thick lump of wood," akin to O.N. kumba "block of wood." Meaning "blockhead" is first attested 1883.
"This mental exercise lasted until Biddy made a rush at them and distributed three defaced Bibles (shaped as if they had been unskillfully cut off the chump end of something), more illegibly printed at the best than any curiosities of literature I have since met with, speckled all over with ironmould, and having various specimens of the insect world smashed between their leaves."
- Charles Dickens, Great Expectations