"Oh Shit, Sweet Flips" is allegedly an elven lullaby sung to young Taako by his mother. It is also sung to Merle by Magnus during the crystalized-arm removing fiasco in the Crystal Kingdom arc. Taako alleges of the existence of the lullaby to justify his reactions to seeing Carey and Killian handily dispatch of robots behind a frozen door using Clairvoyance. Taako pretends that nothing was behind the door, but Merle and Magnus figure out the deception.
The team comprised of Carey, Killian and eventually No-3113 would go on to be referred to as "Team Sweet Flips" after this interaction.