just passing through
Nothing, I was just passing by and popped in.
— El hijo de la novia (2001)
No le interesaría a alguien de paso como tú.
It wouldn't interest someone just passing through like you.
— Las flores de la guerra (2011)
De todos modos, yo estaba, simplemente de paso.
Anyway, I was just passing through.
Pues de paso, tráeme un bocadillo.
And while you're at it, bring me a sandwich.
— Río Místico (2003)