spiv

[Bailey]

spiv (spv)
n. Chiefly British Slang
1. One, usually unemployed, who lives by one's wits.
2. One who shirks work or responsibility; a slacker.

[Dialectal spif, dandified, dandy.]

The American Heritage® Dictionary of the English

Here's one I haven't heard before.

mark knows-a-few-of-those Bailey

[Perry]

Nor had I.