obsolete One belonging to the Anabaptist faith, in which believers are baptized after infancy. "Autem" is an obsolete slang word for church, so an "autem dipper" is one whose faith is based on baptism (that is, a "dip" in water). As one has no concept of faith as an infant, the autem dippers believe that baptism should take place when one is old enough to affirm belief in the church.