A smell-a-like is a perfume that smells like a designer fragrance but with a different name and packaging, and at a cheaper price. A smell-a-like isn't an exact copy, but often smells very similar.
Versace's VERSENSE smells a lot like the original Diorella and is a similar light green color. The scent is flowery citrus, and I love it. Looked for the real Diorella and all I found were imitiations. The bottle said Diorella, but the smell just said cheap. And it was.