Did you acquire the nickname "Two Sheds" simply because you said you were thinking about buying a second shed?

No, but when I bought a second shed some years ago (when living with an ex- who already had one shed full of her own crap) I did start referring to myself as "<firstname> 'Two Sheds' <lastname>" in honour of Monty Python.

Sadly (or happily?) I don't have three buttocks.