‘滚开’ is a compound verb with two distinct but related meanings. Literally, ‘滚’ means ‘to roll’ or ‘to boil’ (as in water reaching boiling point), and ‘开’ means ‘to open’ or ‘to separate’. Together, ‘滚开’ first describes the physical process of liquid boiling vigorously until it evaporates or overflows — hence ‘to boil away’. For example, when soup is left unattended on high heat, it may ‘滚开’ and spill over.

In informal, colloquial speech, ‘滚开’ is widely used as an impolite, forceful command meaning ‘scram!’ or ‘get lost!’, similar to English slang like ‘buzz off’ or ‘beat it’. It carries strong emotional weight — often expressing anger, impatience, or dismissal — and is inappropriate in polite or formal contexts. The tone is emphatic and abrupt; it’s almost always spoken with rising or sharp intonation, never written in formal documents or used toward elders or superiors.