Slang for the children of a single mom. Deriving from the fact that if you sleep with her and spend the night, you will have to buy her kids a yoohoo the next morning.
a word sometimes used to convey excitement, particularly on facebook, by idiots who don't know that the word is just a chocolate drink. it should be woohoo.
A yoohoo is someone obsessed with a certain muppet. Her home is usually R&S on yahoo answers and she trolls uncontrollably. A Yoohoo also makes others mad by stealing aways muppets. She is also obsessed with the Disney Princesses and she despises report monkeys.
Girl: Stop pissing off the parenting section on yahoo answers. You are such a Yoohoo!