go soak your head

all dressed up and nowhere to go

Elaborately attired or otherwise fully prepared for an anticipated situation or activity which, nevertheless, fails to occur.

all systems go

Everything is ready.

as you go

While one is doing (something); as one progresses.

bang one's head against a brick wall

To waste effort on a futile project.

bash someone's head

To beat up someone violently.

big head

An inflated ego, an exaggerated belief in one's own importance.

bite someone's head off

To severely berate someone.

blow someone's head off

To shoot someone in the head.