What is a sod mat?

Well sod means:

1. surface layer of ground containing a mat of grass and grass roots

2. an enzyme that catalyzes the conversion of super oxide into hydrogen peroxide and oxygen

3. someone who engages in anal copulation (especially a male who engages in anal copulation with another male)

4. an informal British term for a youth or man

And well I'm sure you know what a mat means but anyways I'll put it anyways......:

Noun: A piece of protective material placed on a floor, in particular.

Verb: Tangle (something, esp. hair) in a thick mass: "sweat matted his hair".

So a sod mad is like a tangled mat. Hope this helped :-)