The phrase "kiss off" is a slang expression usually interpreted as a dismissive termination of a conversation or relationship. Synonyms for this phrase would include "get lost," "buzz off," "take a hike" or "hit the road." Other words or phrases that could be used in a similar context include "go away," "leave me alone," "beat it," "scram," "give me a break," and "cut it out." These expressions are used to communicate a sense of irritation or annoyance with someone's behavior, attitude, or presence. While they may not necessarily be polite or socially acceptable, they are effective in conveying a message that the speaker wants the other person to go away or end the conversation as soon as possible.