A word used as a filler in a sentence when, do to lack of a second grade education, sobriety, or a loss for words in a conversation or general statement.
I see your mouthmoving, but all I hear is a bunch of geeb. You should get that checked out.
One of your friends in Geometry class.
"Geometry Buddy" shortened to "GB" later shortened to "geeb".
Could also refer to other classes starting with G, such as "Gym Buddy" or "Geography Buddy".