It's Not English; It's Texish
The engine's runnin', but ain't nobody drivin'. [not real smart]

Tighter than the bark on a tree. [stingy]

We've howdied, but we ain't shook yet. [We've met, but we haven't been formally introduced.]

She's got tongue enough for ten rows of teeth. [She's a talker]

This ain't my first rodeo. [I've been around].

Slide off and cool your saddle. [rest]

It's as hot as the underside of a saddle blanket after a hard ride. [hot!]

He's as shy of truth as a goat is of feathers. [he lies]

Sounds like he must've gotten sour milk from his mother. [he's a malcontent]