What does he mean by "meddling fool"?

Native speaker’s answer
Rebecca
A "meddler" is someone who puts their nose in others' business, a person who intervenes in other people's affairs. A "fool" is an idiot or simpleton. Together, "meddling fool" is used as an insult towards a person seen to be foolishly meddling in someone else's business. Ex: Leave them alone. Don't be a meddling fool. Ex: Meddling fool, look what you've done!