Green’s Dictionary of Slang

con v.

[abbr. SE confidence trick]
(orig. US)

1. [late 19C+] (also con along) to fool a victim in one or another form of confidence trick.

2. [late 19C+] to persuade, to coax (without criminal intent); usu. as con someone into.

3. [1960s+] to tell stories, to fantasize.

In phrases

con out of (v.)

[1910s+] to trick someone into handing over or giving up something they would prefer to hold on to.

con up (v.)

[1980s] (Aus.) to charm a woman; the ultimate aim being seduction.