Tā zhěngtiān gēn zài lǎobǎn hòumian pāi mǎpì, dàjiā bèihòu dōu jiào tā gēnpìchóng.
He trails after the boss all day, flattering him, and behind his back everyone calls him a toady.
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跟屁虫 is literally 'follow-bottom bug'. Rude in form, it is usually teasing and affectionate when said of a small child who trails after an older sibling. Said of an adult it is an insult: a hanger-on or toady.
