The mints that end up in your
hand when you only wanted three or so, but the casing dispensed too many, so you put the excess mints back in
even though they touched your
hand.
Once an
act of tacwash has been committed, the mint-dispensing casing should be clearly marked with the tacwasher's name so that the mint doesn't mistakenly
touch someone else's
hand (i.e. eww).