Green’s Dictionary of Slang

1. eggs.

1899

C. Rook Hooligan Nights 94: They arrived without breaking a single egg. Young Alf is proud of this achievement, for wobblers are tricky things to handle.

2. pills, usu. amphetamine.

1988

J. Healy Grass Arena (1990) 159: Been taking wobblers.

3. the female breasts.

1992

M. Frayn Now You Know 88: This fellow’s got her down over a Harley, right, with her great wobblers all like hanging over the handlebars.