I do not find your companion or possession attractive or appealing.
2.
British Englishslanghumorousidiomatic
A jocular remark used to reserve the right to attempt to attract or 'chat up' an attractive person who is accompanying someone the speaker considers unattractive.
Examples:
EN: Oh, I don't fancy yours much, she's a right old boiler!
ES: Hay una que no me gusta. Es una gallina vieja.
ES: Yo no le divertiré mucho, ¡es un viejo caldera!