Green’s Dictionary of Slang

monte n.1

[abbr. three-card monte n.]

1. [mid-19C+] (US Und./gambling, also monte game) the three-card trick, ‘find the lady’; also attrib.

2. [late 19C–1900s] (Aus., also monte-man, monty) a racecourse tipster.

3. [late 19C+] (Aus./N.Z., also monty) an absolute certainty.

4. [1900s] one who plays sense 1 above.

5. [1930s] (Aus.) a lie.

6. [1980s+] (N.Z.) an admirable person.

In compounds

monte-man (n.) [sense 1 + SE man; however, he does not necessarily practise the three-card monte swindle]

1. [late 19C+] (Aus./US) a confidence trickster.

2. see sense 2 above.