A Spud Juggler is someone who is always playing with testicles, this also implies that they are having sex with men!
It can be aimed at both males and females!
Ash- Remember that James from high school?
Andy - Yeah! He was a right Spud Juggler him...
-or-
Ash - I always see Gemma with different men!
Scott - Yeah me too, she is a right Spud Juggler!