Green’s Dictionary of Slang

faking n.

also faiking
[fake v.1 ]
[19C]

1. (UK Und.) thieving.

2. (UK Und.) cheating (e. g. at a card game).

3. (UK prison) counterfeiting illness.

4. making, constructing.

In compounds

faking-boy (n.) (also faking kid)

[mid-19C] (UK Und.) a thief.