Het up

Try to keep your cool and not get het up.

"I reckon," he said, directing his remarks toward no one in particular, "that we've all been rather hasty in this matter, being het up as we were with the strain of what we been through an' so it seems to me, […]

‘What ever happened ashore to get that cold old turtle so het up?’ he demanded.

We must do an end run around these people, not make the mistake of thinking they are just “het up” or have wended a few yards into a wrong turn.