Coinage

[learnedax]

lemon twist \'le-mən-'twist\ n (2004) [from mishearing of 'love interest'] 1 : a partner in any of a variety of romantic relationships, characterized usu. by a certain breezy affection 2 : the object of such affection regardless of existing relationship

Comments

[juldea.livejournal.com]

Another happy coincidence: a archaic term for sweetheart was 'leman,' pronounced (according to Merriam Webster) just like lemon.