四海之内皆你妈吖
[sì hăi zhī nèi jiē nĭ mā ā]
The phrase 'Everywhere within four seas, all are your mother's f**k!' uses a vulgar and hyperbolic expression conveying extreme frustration or anger, although such an impolite term is not advisable for common use. In Chinese Internet slang, it exaggerates a very negative sentiment.