Referring to shifty types:

He'd nick the eye out of your head and come back on your blind side for the other one.

If you shake hands with that fella, you'd better count your fingers afterwards.

Referring to ugliness:

As rough as a badger's chuff.

Ugly as sin.

Referring to miserliness:

As tight as a gnat's chuff.

Wouldn't spend Christmas.

Still has his communion money.

Referring to heat:

Hot as the hobs of Hell

(because sweating so much) If it wasn't for the sheugh (ditch) in my arse, I'd be drownded.