1A person employed to catch moles. Frequently figurative and in various extended uses, especially as a general term of abuse.
As a general term of abuse, compare "spider-catcher".
2 slang, rare, archaic The vagina. Compare "mole".
3A counter-espionage operative employed to detect moles.
Late 16th century; earliest use found in Thomas Tusser (c1524–1580), writer on agriculture and poet. From mole + catcher.