A gilpin is a term for "
sucker" or "
chump" that dates from as early as the 1910s but rarely appears in the modern century. Consider this
line from
1) James Cagney's taxi driver friend in THE ROARING TWENTIES (1939): "To Long
Island it's fifteen dollars for the
wise guys, 30 dollars for the gilpins."
2) Cagney, upon realizing he was
naive, says, "I was a such a gilpin."