BBSK 

Similar to BFF, but refers to someone who you have been best friends with since kindergarten, hence the acronym "BBSK" means "best bud since kindergarten". Coined by Ryan Laserbeam (played by Matt Shively), in reference to his best friend True Jackson (played by Keke Palmer) on "True Jackson, VP".

Hey guys, you have gotta meet my awesome bud Doug sometime. He's my BBSK.

BBSK by tmanokc June 24, 2010

BBSK 

Best Bud Since Kindergarden

"You have to take me! I'm your BBSK!"

BBSK by Artsygal November 26, 2010