プリクラ is short for プリント倶楽部 [ぷりんとくらぶ] and means “print club.”  The word プリクラ is yet another example of the Japanese adopting foreign loan words (外来語 [がいらいご]) and combining them in somewhat strange ways to describe something in Japanese.

プリクラ are the photos you can have taken in photo booths in malls and ゲーセン (ゲームセンター “game centers” or video game arcades) on which you can doodle and write things.  Perhaps a visual example is in order: