Furus are "fake gurus." It comes from the Fintwit space where "furus" share their +1000% option trades as if they're geniuses in order to get you to sign up for

Furus are "fake gurus." It comes from the Fintwit space where "furus" share their +1000% option trades as if they're geniuses in order to get you to sign up for their expensive Substack.