This is the 4902nd most frequent Portuguese word.
gota
Drop.
Here 'gota' refers to a small liquid drop, illustrating its literal use.
Uma gota d'água caiu da torneira.
A drop of water fell from the faucet.
In this sentence, 'gota' is used metaphorically to indicate a small quantity or amount.
Não tenho nem uma gota de energia hoje.
I don't have even a drop of energy today.
'Gota' in this phrase is part of an idiomatic expression meaning the last and decisive aggravation.