Cabbage fever

When one isn't able to get an erection.
Whereas the stalk won't hold up the head.
Usually from a temporary reason ie. Nerves, drunk etc.
A term used jokingly on construction crews.

The man didn't have sex, due to a case of cabbage fever.

mites are on a chicken's ass.

Said when one can't make up their mind.
Heard it said by an oldster in Texas.

Man A. "I might go do that.
Man B. "Might!? Mites are on a chicken's ass.