cardboard box
Proposed by a contributor, not yet supported by evidence.
Sense 1
Meaning · English
Syphilis.
Register: slang
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Sense 2
Meaning · English
Someone who is very dull and uninteresting.
Register: derogatory, slang
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “cardboard box” mean?
Syphilis.
Is “cardboard box” formal or informal?
cardboard box is generally slang.