一杆长枪捣菊花
[yī gān zhăng qiāng dăo jú huā]
While literally it refers to using a spear against chrysanthemum (in English, this sounds rather nonsensical), in Chinese context especially on internet, '菊花' (chrysanthemum flower) can have a vulgar connotation, referring to intimate or inappropriate actions. The name carries an implicit crude or risque meaning which may not appropriate for all audiences.