How Well Do You Know English Slang?
"young mammal before it is weaned," late 14c., agent noun from suck. Slang meaning "person who is easily deceived" is first attested 1836, American English, on notion of naivete; the verb in this sense is from 1939. But another theory traces the slang meaning to the fish called a sucker (1753), on the notion of being easy to catch in their annual migrations. Meaning "lollipop" is from 1823.
To victimize or dupe someone: if I can sucker him into drawing first (1939+)Related Terms
[origin uncertain; perhaps fr the sucker, a fish supposed to be easily caught; perhaps fr the notion of an unweaned and relatively helpless creature, as suggested by an earlier sense, ''greenhorn, simpleton'']