Acabar em pizza
It literally means End up in pizza
It’s used when there is no solution to a problem or a situation, to come to nothing and to end in nothing (especially in cases of corruption, and no one is punished).
Vocês não levam nada a serio, tudo acaba em Pizza
You guys take nothing seriously, all ends in nothing
Acertar na mosca
It literally means to hit in the fly
And it means to bet and give the best guess
A) Quantos anos você acha que eu tenho? How old do you think I am?
B) 32 anos
A) Acertou na mosca! (or you can only say “na mosca”)
A céu aberto
It literally means to open sky and it actually means open-air
Não irei para essa festa, vai chover, e o lugar é a ceu aberto!
I won’t go to the party, it will rain, and the place is an open-air
Achar (procurar) chifre em cabeça de cavalo
It literally means to find (to look for) a horn in a horse’s head and it actually means
“To look for troubles”
Já te falei que não há problema algum, você procura chifre em cabeça de cavalo!
I have already told you, no worries, but you look for troubles
A dar com pau
It literally means to give with a stick and it actually means “big quantity or a lot of something”
A festa estava cheia, tinha gente a dar com pau!
The party was full, there were lots of people

