The Australian comedy series, which follows characters such as teenage delinquent Daniel Sims, surf champion Blake Oldfield and youth detention centre worker Gran, has lost about a third of its audience since it premiered three weeks ago.
According to the Herald Sun, the first episode of Angry Boys was watched by almost 1.4 million viewers, but last night's fourth instalment was only viewed by an audience of 920,000. Last week's episode was even lower with 805,000 viewers.
Since the show debuted, it has been met with a mixed response from fans. Some described it on Twitter as the "pinnacle" of "comic genius", but others said that they were "disappointed" in Lilley's latest creation.
Lilley recently hit back at reports that his material was inappropriate, saying that although some of his characters are "not appropriate", the jokes are meant to be "really funny".
He also said: "When I'm pushing the boundaries and seemingly provoking people, it's more about me just wanting to do something to surprise people and do something interesting. I like entertainment that's a bit provocative and a bit shocking."
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Watch the Angry Boys trailer below: