Let the cat out of the bag/Spill the beans

[Tomisimo]

Youg "posh" girls usually shrink " por favor" to "porfa" or "porfi" saying "porfa, haz XXXX" or "porfi, haz XX", but I have neve heard " por forfi"

Saludos :D
You can also add an s on the end: porfas, porfis (at least in Mexico)

[Thomson]

There is a TV show called "suelte la sopa". I took that to figuratively mean "spill the beans".

[poli]

You are right, I used to think it meant shake things up, but in a previous entry in this forum, it was determined to mean spill the beans.