Demos, Bs and word humor

What does "demo" mean? First time I asked this question, I remodeled my apartment and the contractor said they will demo. I thought, with graphics? Since then, I have learned that "demo" can mean: demonstration (garden CS kind), demolition (mo contractor kind), demote (an ad), demographic (again, ads), ...

Today over lunch I faced beer pressure. (no typos there)

I get confused between the B "triangle of beaches: Belize, Bermuda, Bahamas and Barbados.