Green’s Dictionary of Slang

a one-legged man.

[1851		Melville Moby Dick (1907) 142: Aye, aye! it was that accursed white whale that razed me; made a poor pegging lubber of me for ever and a day!].
1922–24		O.O. McIntyre White Light Nights 112: Out of a wine and bun shop, a peg-leg beggar lurched.
1937–84		Partridge DSUE (1984) 866: [...] C.20.