The phrase sa me fais plaisir is French for a feeling of pleasure or gratitude, roughly it makes me happy, and the misspelled wording matches how the clip is titled and searched on soundboards. Short foreign-language reaction lines like this spread easily because the tone carries the meaning even for listeners who do not speak French. It has become a compact happy reaction for memes, short videos and group chats, reused whenever a moment calls for sincere thanks, delight or a slightly exaggerated show of satisfaction.