While there are ways to express a rude or dismissive sentiment in Portuguese, there's no direct equivalent to "up yours" that's widely understood.
Here are some examples of Portuguese phrases that might be used in a similar, albeit less direct, way:
* "Vai para o diabo!" (Go to the devil!) - This is a strong insult, but it's less common in everyday language.
* "Vai te catar!" (Go pick your nose!) - This is a rude and dismissive expression.
* "Sai da minha vista!" (Get out of my sight!) - This is a more aggressive way of telling someone to leave.
* "Que te vá!" (May you go!) - This can be used sarcastically or with disdain.
However, it's important to note that these phrases can be considered quite offensive and should be used with extreme caution, if at all.
Instead of using vulgar expressions, it's often more effective to express your displeasure in a calm and assertive way. You can simply choose to ignore someone, or state your opinion clearly and respectfully.