ETYMOLOGY
apparently from twig (to do anything strenuously or vigorously, obs.) + -er
EXAMPLE
“… Eaws yerely by twining, rich masters do make the lamb of such twynners, for breeders go take.
For twinlings be twiggers, encrease for to bring:
though some for their twigging, peccantem may sing
Calues likely, yt come betwene Christmas & Lent,
take huswife to rere, or else after repent. …”
From: Fiue Hundreth Points of Good Husbandry vnited to as many of good huswiferie first deuised,
By Thomas Tusser, 1573
Lexicophilia 