The line comes from Joey Tribbiani, played by Matt LeBlanc on Friends, which ran on NBC from 1994 to 2004. Joey's 'How you doin'?' became one of television's most quoted pickup lines, repeated in countless episodes whenever he tried to charm someone. The phrase escaped the show long ago and now lives on in memes, edits, comment sections and short videos wherever a playful, flirty greeting fits. Its staying power comes from the delivery: everyone recognises the smirk behind it.