Verb
(transitive, computing, informal) To transform data in an undefined or unexplained manner, as for example when data wrangling requires nonsystemic or nonsystematic edits.
(transitive, computing, informal) To add a spamblock to (an email address).
(transitive, genealogy, informal) To corrupt a record about an individual by erroneously merging in information about another individual.
It looks like this record is munged—it has this person's birth date, but his father's death date