In Spain he is the nickname of a singer of Andalusian origin, named Manuel Ruíz. It is also a way of calling the gecko or perequén ( Family Gekkonidae). It is also the name of a doll-like drawing or sucker. In Argentina it means brothel or brothel. .
More used in lunfardo than that, it also means "brothel". See chbebe, quilombo.
It's making love to someone else
In Catalonia, queco means retrograde, cheesy, stale.
DIMINUTIVE OF DOLL