Street hookers use this term to describe a blow job. 'Little' meaning a smaller amount of money than a lay and also less time. It is also less distasteful as they can get what they want (the drugs) quicker, what with no undressing etc. Also easier to do in a vehicle.
A very attractive young woman with a very playfull personality, who's body type is slender with perfect curves. When held Littleone fits perfectly in your arms and under your chin like matching puzzle pieces. Littleone also has a voice so sweet that it is near impossible not to be aroused sexually when heard. To be referred to as Littleone she must also have a shining smile that can brighten a whole room instantly. Littleones also have a distain for vulgar men, the term 'ointment', and of course bananas.
Him - "Hey, come over here and gimme a hug"
Her - "I'm super busy right now!"
Him - "Oh, c'mon, Littleone. It'll only take a sec."