The vocabulary behind フリの割にボケが面白くない

Question

I can't find a concrete definition for the vocabulary in this sentence. "フリの割にボケが面白くない" フリ seems to have four different meanings in every japanese dictionary I can find, 割 and 割に seem to have different definitions that I can't wrap my head around the logic of, and ボケ is just a complete mystery to me. The context of this sentence is that someone attempted to make a joke, and the speaker is annoyed at it. I think it translates into something like "for a joke setup, Bokes aren't interesting". But I'm not sure and would like a bit of an explanation/clarification to the definition of these words please. And maybe also an explanation as to what the の and に particles are conveying in these instances.

EDIT: Here's the image for extra context:

Answer 1

First, basically ボケ is a joke (itself) or a person who tells jokes (or plays the role of telling jokes). I kinda feel gag may be better, but may be off. It is mostly about understanding a comedy format in Japanese language.

• 突っ込む所 - is this what it means?

Next, わりに implies a sort of disproportionality. It can be negative or positive. (cf. わりに - #2)

• Grammar justification for 「〜わりに（は）」

E.g.

• このレストランは高いわりにおいしくない - expensiveness and quality of food are disproportional (negative example)

• この本は短いわりに中身が濃い - the book is short but rich in contents (positive)

Lastly, the most relevant sense of ふり is:

８ 本題に入るためのきっかけ。前置きとしてする話。「前—」

So understanding it as setup is fine. As per the definition, it is a part of the joke that precedes the punchline. Also, it can be used as a signal or cue for doing something (including telling a joke).

Understanding the sentence requires more context, but one possibility is that the preceding part is lengthy and the final joke is not proportionally funny.