While "naff off" is a colloquial expression commonly used in the UK to tell someone to go away or leave, there are many alternative phrases that can be used to convey a similar message. Some options include "buzz off," "beat it," "scram," "get lost," "take a hike," "sod off," "bugger off," "go away," "shoo," "shove off," "vamoose," "hit the road," or simply "leave." The appropriate phrase will depend on the context and the relationship between the speaker and the person being addressed. Regardless of the exact words used, the intention is clear: it's time to move on and disengage.