Space fail 

A failure to effectively use the space bar, resulting in a sentence thatlook slikethi s

As defined by Doctor Nick 'Dreader' Wilson.

Space fail: Typic alexampl eofa spac efail !

Space fail by otter-boy August 26, 2010

spacefiller 

A person (typcially a girl) who is only used to pleasure another person (typically a man) in the time of space before he is in another relationship.

Grace and Mike weren't dating. Grace was just Mike's spacefiller until he hooked up with Kayla.

spacefiller by J. Rhodes May 13, 2008