The line comes from Mary, Mary, first written by Michael Nesmith and recorded by The Monkees in 1966, then remade as a rap track by Run-DMC for their 1988 album Tougher Than Leather. Run-DMC turned the chorus into a teasing exchange, popularising the phrasing why ya buggin in hip-hop slang for acting bothered or irrational. Decades later the hook resurfaced on soundboards and short videos as a ready-made reaction, kept alive because the question is instantly understood even by listeners who do not know the full song.