The phrase is everyday Swedish slang, with jävla used as a strong intensifier and tråkigt meaning boring, so the clip translates roughly as so damn boring. It circulates as a short reaction sound rather than a line from a known film or show, and its appeal comes from how blunt and relatable that judgement is. Creators tend to reuse it whenever something drags on, turning a familiar complaint into a shared joke for Swedish-speaking viewers and anyone who recognises the tone.