Bare bottom swollen anus

光腚肿菊 (guāngdìng zhǒng jú): bare bottom swollen anus

Sounds similar to 广电总局 (guǎng diàn zǒng jú), the commonly used abbreviation for the State Administration of Radio, Film, and Television (SARFT)[zh]. The administration is sometimes referred to simply as 光腚 or bare bottom, as it was in this song. See also SARFT is always anxious.