Is it a bad idea for someone with an abdominal aortic aneurysm (aaa) to lift weights?

Depends: Extreme high blood pressure can induce rupture but of course also depending on the size , type/shape of the aneurysm . So small AAA less than 4 cm rarely rupture less than 1% . Ask you medical doctor and avoid very heavy excercise if your aneurysm is big.

Yes: Sudden increases in intravascular pressure could complicate an otherwise stable aneurysm. Discuss this seriously with your doctor.

AAA lift weights?: Would depend on the size of the aneurysm.