Play silly buggers
Definition 1 of 1
Pro Tip 1/3Cultural Nuance
Used in British and related cultures; may not be understood or appreciated elsewhere. 
He's been playing silly buggers instead of doing his homework.
Pro Tip 2/3Negative Connotation
Implies disapproval of someone's behavior; not a term of endearment. 
Our team lost because the goalie was playing silly buggers during practice.
Pro Tip 3/3Informal Language
Not suitable for formal contexts; use in casual conversation. 
We can't afford to play silly buggers on this project, guys.