No widely documented original source is attached to this clip, and it circulates mainly as a standalone soundboard reaction rather than as a quote from a known film or show. Its humour comes from the contrast between an ordinary yard chore and the serious way short voice memes are usually delivered online. Clips like this spread through reposts, chat shares and short video edits, where a familiar everyday phrase can stand in for telling someone to go away, stop complaining, or get on with a job they have been putting off.
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Go mow the lawn is a short voice clip of a blunt chore command, used as a funny dismissal and reaction sound in video meme edits and online chats.
The sound is a brief, flatly delivered voice line telling someone to go mow the lawn, said like a chore being handed off without discussion. The wording is plain and domestic, which is what makes it land as a joke when it appears out of context. It works as a deadpan shutdown, a mock-parental order, or a random non sequitur dropped into a conversation. Because the clip is only a second or so long, the command hits instantly and leaves a clean beat afterwards, letting the reaction of the person on screen carry the rest of the humour.