The word "boo" has become recently fashionable as a term used to refer to a lover...I'm sure you can recall several songs that talk about making someone "a boo". But investigation has revealed that it is not a term to suit that purpose...you are just one click away from ending your love for the word "boo".
Fictional Characters

Boo (character), a ghost character in the Mario series
Boo, a hamster in Megatokyo
Boo, a baby human girl from Monsters, Inc.
Boo, a hamster belonging to the Minsc in Baldur's Gate
Boo, a character in the manga and anime Crayon Shin-chan
Majin Buu (魔人ブウ Majin Bū?, also translated as "Majin Boo", a magical life form in Dragon Ball
Boo Radley, a character in To Kill a Mockingbird
Boo! (comic strip), a character in the British comic The Dandy created by Andy Fanton
Film and television
Boo! (film), a 1932 comedy film
Boo (film), a 2005 horror film
Boo! (TV series), a 2003 BBC children's television series
"Boo" (CSI: NY episode)
"Boo! (a.k.a. I'm With Her)", a 2004 episode of Frasier
"Boo" (Dark Angel), an episode of the television series Dark Angel

Geography
Boo (Aller), Aller, Asturias, Spain
Boo de Piélagos, Piélagos, Cantabria, Spain
Boo de Guarnizo, El Astillero, Cantabria, Spain
Boo, Sweden, in Stockholm County

Other Uses
Boo (programming language)
Boo.com, a clothing company
Boötes constellation; standard abbreviation
Better Off Out, a political campaign
Boô, a Saxon cattle shed
BOO is the IATA airport code for Bodø Airport in Norway

"Boo!", an exclamation depicted as being uttered by Ghosts to scare or surprise the living.

Yes surely..."boo" is still a term of endearment meaning baby or girlfriend, but with all these associated usage, wouldn't you just find a special name for the one you love?

http://www.tutubranch.com/2013/07/why-never-say-boo.html

Oga Op Relax.....

@Op. Whats up boo?