If it looks like a.......

[Tyre Smoke]

You know that saying, if it looks like a something, smells like a something, etc ,etc it must be a something.

What are the exact words and who is it originally attributed to? Or is it just a saying?

Been going round my head for a day or two now and I can't remember the exact words.

Help!

[LeoZwalf]

Turd?

[Terzo123]

Not sure but Burt Reynolds said it in Boogie nights.

[esselte]

"If it walks like a duck and quacks like a duck I would call it a duck"...James Whitcomb Riley I think...