What does yo qué sé mean?
Expression
how should I know?
Drier than ni idea: it rejects the question as well as answering it. It is also used as filler in the middle of a sentence, to close a list you cannot be bothered to finish: plantas y yo qué sé qué más. Not vulgar, but not friendly either.
—¿Y eso por qué? —Yo qué sé.
