Here are some ways to express the sentiment of "get lost" in Tamil, depending on the context and desired level of politeness:
Formal/Polite:
* நீ போய் விடு (nee poy vidu): This literally means "You go away," but it's a gentler way of asking someone to leave.
* நீங்க போய்விடுங்க (neenga poyvidunga): This is the polite plural form, meaning "You (plural) go away."
* என்கிட்ட இருந்து போ (enggitta irunthu po): This means "Go away from me."
Informal/Less Polite:
* சும்மா போ (summa po): This means "Just go," and can be used to tell someone to leave you alone.
* போடா (poda): This is a very informal and rude way of saying "Get lost." It should only be used with close friends or in very casual settings.
Other Options:
* சும்மா இரு (summa iru): This means "Leave me alone" and is a polite way of telling someone to stop bothering you.
* நீ யார்கிட்டயும் பேச வேண்டாம் (nee yaarkittayum pesaveendaam): This means "Don't talk to anyone," and can be used to tell someone to leave you alone.
It's important to note that the tone of voice and body language can also convey the meaning of "get lost" even if the words themselves are not aggressive.
If you want to be truly polite, it's best to avoid using phrases that could be perceived as rude. You could try explaining your situation and politely asking the person to leave.