To unzip and remove the lower part of a pair of cargo-trousers or cargo-pants when weather or current activities make it appropriate to do so. (See truff)
The sun has come out! Time to de-truff!
The lower parts of trousers (or pants) that can be removed by unzipping them. A contraction of Trouser and Cuff.
Make sure you wash your truffs with the rest of the trousers to ensure the colours continue to match.