Bootyspacer is a term that has come about due to the popular community site such as Myspace. Bootyspacer is a person that likes to upload adult photos or videos of themselves that is to explicit "Nude or Naked" for the general community website like Myspace which usually gets the members account deleted. Due to the success of myspace and youtube there have been other sites that have come out which are the polar opposites myspace, such as mybootyspace and many more..
Hey i just saw that girl Kim, you know the one with at your university? she is a bootyspacer. I just saw her naked pictures and videos on the net!!